Diff r
Author: s | 2025-04-24
Diff r / Delayed by Ga l Segalen different voices, released 1. Diff r / Delayed 1 2. Diff r / Delayed 2 3. Diff r / Delayed 3 Excerpts. Field
PMAP 8521 Example: Diff-in-diff with R: 5: Diff-in-diff with
By default, git log does not generate any diff output. The optionsbelow can be used to show the changes made by each commit.Note that unless one of --diff-merges variants (including short-m, -c, --cc, and --dd options) is explicitly given, merge commitswill not show a diff, even if a diff format like --patch isselected, nor will they match search options like -S. The exceptionis when --first-parent is in use, in which case first-parent isthe default format for merge commits. -p -u --patch Generate patch (see Generating patch text with -p). -s --no-patch Suppress all output from the diff machinery. Useful forcommands like git show that show the patch by default tosquelch their output, or to cancel the effect of options like--patch, --stat earlier on the command line in an alias. -m Show diffs for merge commits in the default format. This issimilar to --diff-merges=on, except -m willproduce no output unless -p is given as well. -c Produce combined diff output for merge commits.Shortcut for --diff-merges=combined -p. --cc Produce dense combined diff output for merge commits.Shortcut for --diff-merges=dense-combined -p. --dd Produce diff with respect to first parent for both merge andregular commits.Shortcut for --diff-merges=first-parent -p. --remerge-diff Produce remerge-diff output for merge commits.Shortcut for --diff-merges=remerge -p. --no-diff-merges Synonym for --diff-merges=off. --diff-merges= Specify diff format to be used for merge commits. Default is`off` unless --first-parent is in use, inwhich case first-parent is the default.The following formats are supported: off, none Disable output of diffs for merge commits. Useful to overrideimplied value. on, m Make diff output for merge commits to be shown in the defaultformat. The default format can be changed usinglog.diffMerges configuration variable, whose default valueis separate. first-parent, 1 Show full diff with respect to first parent. This is the sameformat as --patch produces for non-merge commits. separate Show full diff with respect to each of parents.Separate log entry and diff is generated for each parent. combined, c Show differences from each of the parents to the mergeresult simultaneously instead of showing pairwise diff betweena parent and the result one at a time. Furthermore, it listsonly files which were modified from all parents. dense-combined, cc Further compress output produced by --diff-merges=combinedby omitting uninteresting hunks whose contents in the parentshave only two variants and the merge result picks one of themwithout modification. remerge, r Remerge two-parent merge commits to create a temporary treeobject—potentially containing files with conflict markersand such. A diff is then shown
Diff-in-diff : r/econometrics - Reddit
Diagnostic messages.OUTPUT FILES None.EXTENDED DESCRIPTION None.EXIT STATUS The following exit values shall be returned: 0 No differences were found. 1 Differences were found. >1 An error occurred.CONSEQUENCES OF ERRORS Default. The following sections are informative.APPLICATION USAGE If lines at the end of a file are changed and other lines are added, diff output may show this as a delete and add, as a change, or as a change and add; diff is not expected to know which happened and users should not care about the difference in output as long as it clearly shows the differences between the files.EXAMPLES If dir1 is a directory containing a directory named x, dir2 is a directory containing a directory named x, dir1/x and dir2/x both contain files named date.out, and dir2/x contains a file named y, the command: diff -r dir1 dir2 could produce output similar to: Common subdirectories: dir1/x and dir2/x Only in dir2/x: y diff -r dir1/x/date.out dir2/x/date.out 1c1 Mon Jul 2 13:12:16 PDT 1990 --- > Tue Jun 19 21:41:39 PDT 1990RATIONALE The -h option was omitted because it was insufficiently specified and does not add to applications portability. Historical implementations employ algorithms that do not always produce a minimum list of differences; the current language about making every effort is the best this volume of IEEE Std 1003.1-2001 can do, as there is no metric that could be employed to judge the quality of implementations against any and all file contents. The statement "This list should be minimal'' clearly implies that implementations are not expected to provide the following output when comparing two 100-line files that differ in only one character on a single line: 1,100c1,100 all 100 lines from file1 preceded with " " --- all 100 lines from file2 preceded with "> " The "Only in" messages required when the -r option is specified are not used by most historical implementations if the -e option is also specified. It is required here because it provides useful information that must be provided to update a target directory hierarchy to match a source hierarchy. The "Common subdirectories" messages are written by System V and 4.3 BSD when the -r option is specified. They are allowed here but are not required because they are reporting on something that is the same, not reporting a difference, and are not needed to update a target hierarchy. The -c option, which writes outputMaster Diff-In-Diff Analysis With R - physicsclass.blog
Verify Fitment before purchase. If you have questions contact Sales@EQTuning.comWavetrac diffs are state-of-the-art helical gear differentials designed, developed, and manufactured in the USA by Autotech Driveline. The Wavetrac Differential is the only torque biasing differential on the market with patent-pending technology that mitigates wheelspin when an unloaded wheel condition arises. During zero axle load conditions, the Wavetrac cam device acts to create internal load, maintaining drive on the gripping wheel instead of acting like an open diff (and going nowhere!). Super strong 9310 alloy steel gears are enclosed in case-hardened steel bodies, held together with ARP fasteners. All Wavetrac differentials include a transferable, Limited Lifetime Warranty. ARP Ring gear bolts included (tighten to 85 ft-lbs and use Loctite 242)Fitment:Mk7 Golf R w/ DQ250 AWD (25 tooth ring gear)8V Audi S3 w/ DW250 AWD (25 tooth ring gear)Mk7 Golf GTI DQ250 FWD with VAQ (25 tooth ring gear)*2WD models equipped with a factory Performance Pack VAQ Electronic DifferentialSuggested Add-ons:6 Quarts OEM VWAG DSG OilVW 02E DSG Differential Shim Kit 185WK-188WKAWD 02E DSG Differential Bearing Kit - ALSO 2WD VAQ E-DIFF FITMENTS. Diff r / Delayed by Ga l Segalen different voices, released 1. Diff r / Delayed 1 2. Diff r / Delayed 2 3. Diff r / Delayed 3 Excerpts. Field The diff() function in R calculates the difference between consecutive elements of a vector or matrix. What is the diff() function in R? Overview. The diff() function in R is used to obtain theComo fazer diff in diff no R - Econometria - YouTube
Files in some circumstances, even though they have the same name, is based on the actual output of historical implementations. The message specified here is already in use when a directory is being compared to a non-directory. It is extended here to preclude the problems arising from running into FIFOs and other files that would cause diff to hang waiting for input with no indication to the user that diff was hung. In most common usage, diff -r should indicate differences in the file hierarchies, not the difference of contents of devices pointed to by the hierarchies. Many early implementations of diff require seekable files. Since the System Interfaces volume of IEEE Std 1003.1-2001 supports named pipes, the standard developers decided that such a restriction was unreasonable. Note also that the allowed filename - almost always refers to a pipe. No directory search order is specified for diff. The historical ordering is, in fact, not optimal, in that it prints out all of the differences at the current level, including the statements about all common subdirectories before recursing into those subdirectories. The message: "diff %s %s %s\n", diff_options>, filename1>, filename2> does not vary by locale because it is the representation of a command, not an English sentence.FUTURE DIRECTIONS None.SEE ALSO cmp , comm , ed , findCOPYRIGHT Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at .Triple Diff in Diff resources? : r/econometrics - Reddit
Provided by: manpages-posix_2.16-1_all NAME diff - compare two filesSYNOPSIS diff [-c| -e| -f| -C n][-br] file1 file2DESCRIPTION The diff utility shall compare the contents of file1 and file2 and write to standard output a list of changes necessary to convert file1 into file2. This list should be minimal. No output shall be produced if the files are identical.OPTIONS The diff utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines. The following options shall be supported: -b Cause any amount of white space at the end of a line to be treated as a single (that is, the white-space characters preceding the are ignored) and other strings of white-space characters, not including s, to compare equal. -c Produce output in a form that provides three lines of context. -C n Produce output in a form that provides n lines of context (where n shall be interpreted as a positive decimal integer). -e Produce output in a form suitable as input for the ed utility, which can then be used to convert file1 into file2. -f Produce output in an alternative form, similar in format to -e, but not intended to be suitable as input for the ed utility, and in the opposite order. -r Apply diff recursively to files and directories of the same name when file1 and file2 are both directories.OPERANDS The following operands shall be supported: file1, file2 A pathname of a file to be compared. If either the file1 or file2 operand is '-' , the standard input shall be used in its place. If both file1 and file2 are directories, diff shall not compare block special files, character special files, or FIFO special files to any files and shall not compare regular files to directories. Further details are as specified in Diff Directory Comparison Format . The behavior of diff on other file types is implementation-defined when found in directories. If only one of file1 and file2 is a directory, diff shall be applied to the non-directory file and the file contained in the directory file with a filename that is the same as the last component of the non- directory file.STDIN The standard input shall be used only if one of the file1 or file2 operands references standard input. See the INPUT FILES section.INPUT FILES The input files may be of any type.ENVIRONMENT VARIABLES The following environment variablesThe diff Function in R - Stats with R
Dec 25th, 2020 - written by Kimserey with . Visual Code ships with powerful Git support. In this post we will look at how we can use Visual Code as default diff and merge tool for Git.Using VSCode command lineIn this post we assume that we have installed VSCode and have access to code command line. If you don’t have access run CMD SHIFT P > shell command and install code in command path. Then we should be able to do:12345678910111213141516171819❯ code -hVisual Studio Code 1.51.1Usage: code [options][paths...]To read from stdin, append '-' (e.g. 'ps aux | grep code | code -')Options -d --diff Compare two files with each other. -a --add Add folder(s) to the last active window. -g --goto Open a file at the path on the specified line and character position. -n --new-window Force to open a new window. -r --reuse-window Force to open a file or folder in an already opened window. --folder-uri Opens a window with given folder uri(s) --file-uri Opens a window with given file uri(s) -w --wait Wait for the files to be closed before returning. --locale The locale to use (e.g. en-US or zh-TW). --user-data-dir Specifies the directory that user data is kept in. Can be used to open multiple distinct instances of Code. -h --help Print usage.This verifies that code is accessible from path. The important commands here are: --diff: open VSCode with the difftool feature, --new-window: forces VSCode to open in a new window (useful when we already have VSCodeWhat do the terms: no diff, mid diff high diff mean? : r - Reddit
In a format using lines of context, has been included. The format is useful for a variety of reasons, among them being much improved readability and the ability to understand difference changes when the target file has line numbers that differ from another similar, but slightly different, copy. The patch utility is most valuable when working with difference listings using the context format. The BSD version of -c takes an optional argument specifying the amount of context. Rather than overloading -c and breaking the Utility Syntax Guidelines for diff, the standard developers decided to add a separate option for specifying a context diff with a specified amount of context ( -C). Also, the format for context diffs was extended slightly in 4.3 BSD to allow multiple changes that are within context lines from each other to be merged together. The output format contains an additional four asterisks after the range of affected lines in the first filename. This was to provide a flag for old programs (like old versions of patch) that only understand the old context format. The version of context described here does not require that multiple changes within context lines be merged, but it does not prohibit it either. The extension is upwards-compatible, so any vendors that wish to retain the old version of diff can do so by adding the extra four asterisks (that is, utilities that currently use diff and understand the new merged format will also understand the old unmerged format, but not vice versa). The substitute command was added as an additional format for the -e option. This was added to provide implementations with a way to fix the classic "dot alone on a line" bug present in many versions of diff. Since many implementations have fixed this bug, the standard developers decided not to standardize broken behavior, but rather to provide the necessary tool for fixing the bug. One way to fix this bug is to output two periods whenever a lone period is needed, then terminate the append command with a period, and then use the substitute command to convert the two periods into one period. The BSD-derived -r option was added to provide a mechanism for using diff to compare two file system trees. This behavior is useful, is standard practice on all BSD-derived systems, and is not easily reproducible with the find utility. The requirement that diff not compare. Diff r / Delayed by Ga l Segalen different voices, released 1. Diff r / Delayed 1 2. Diff r / Delayed 2 3. Diff r / Delayed 3 Excerpts. Field The diff() function in R calculates the difference between consecutive elements of a vector or matrix. What is the diff() function in R? Overview. The diff() function in R is used to obtain the
diffobj - Diffs for R Objects
I am trying to initialize a 2D concurrent_hash_map, a container available in the Intel TBB library. Compilation passes and there is no error at runtime. However, not all initialized values are available in the container leading to incorrect behavior.The hash map is defined as[cpp]templatestruct MyHashCompare { static size_t hash(const K& key) { return boost::hash_value(key); } static bool equal(const K& key1, const K& key2) { return (key1 == key2); }};typedef concurrent_hash_map > ColMap;typedef concurrent_hash_map > RowMap;[/cpp]The function object is defined as follows. Could the reason for the incorrect behavior originate here?[cpp]class ColumnInit { RowMap *const pMyEdgeMap; public: void operator()(const blocked_range& r) const { RowMap* pEdgeMap = pMyEdgeMap; RowMap::accessor accessX; ColMap::accessor accessY; for(size_t n1 = r.begin(); n1 != r.end(); n1++) { pEdgeMap->insert(accessX, n1); for(int n2 = 1; n2 { int diff = abs((int)n1 - n2); if ((diff == 8) || (diff == 1)) { assert((accessX->second).insert(accessY, n2)); accessY->second = -1; } else { assert((accessX->second).insert(accessY, n2)); accessY->second = 0; } } } } ColumnInit(RowMap* pEdgeMap): pMyEdgeMap(pEdgeMap) { }};[/cpp]The function object is invoked from a call to parallel_for as follows:[cpp]parallel_for(blocked_range(1,64,16), ColumnInit((RowMap*)&mEdges), simple_partitioner());[/cpp]Any suggestions or feedback would be great.Thanks.How to Use diff Function in R - Dive into the diff func
Preimage in the deletion partof a delete/create pair. -l The -M and -C options involve some preliminary steps thatcan detect subsets of renames/copies cheaply, followed by anexhaustive fallback portion that compares all remainingunpaired destinations to all relevant sources. (For renames,only remaining unpaired sources are relevant; for copies, alloriginal sources are relevant.) For N sources anddestinations, this exhaustive check is O(N^2). This optionprevents the exhaustive portion of rename/copy detection fromrunning if the number of source/destination files involvedexceeds the specified number. Defaults to diff.renameLimit.Note that a value of 0 is treated as unlimited. --diff-filter=[(A|C|D|M|R|T|U|X|B)...[*]] Select only files that are Added (A), Copied (C),Deleted (D), Modified (M), Renamed (R), have theirtype (i.e. regular file, symlink, submodule, …) changed (T),are Unmerged (U), areUnknown (X), or have had their pairing Broken (B).Any combination of the filter characters (including none) can be used.When * (All-or-none) is added to the combination, allpaths are selected if there is any file that matchesother criteria in the comparison; if there is no filethat matches other criteria, nothing is selected.Also, these upper-case letters can be downcased to exclude. E.g.--diff-filter=ad excludes added and deleted paths.Note that not all diffs can feature all types. For instance, copied andrenamed entries cannot appear if detection for those types is disabled. -S Look for differences that change the number of occurrences ofthe specified (i.e. addition/deletion) in a file.Intended for the scripter’s use.It is useful when you’re looking for an exact block of code (like astruct), and want to know the history of that block since it firstcame into being: use the feature iteratively to feed the interestingblock in the preimage back into -S, and keep going until you get thevery first version of the block.Binary files are searched as well. -G Look for differences whose patch text contains added/removedlines that match .To illustrate the difference between -S --pickaxe-regex and-G, consider a commit with the following diff in the samefile:+ return frotz(nitfol, two->ptr, 1, 0);...- hit = frotz(nitfol, mf2.ptr, 1, 0);While git log -G"frotz\(nitfol" will show this commit, git log-S"frotz\(nitfol" --pickaxe-regex will not (because the number ofoccurrences of that string did not change).Unless --text is supplied patches of binary files without a textconvfilter will be ignored.See the pickaxe entry in gitdiffcore[7] for moreinformation. --find-object= Look for differences that change the number of occurrences ofthe specified object. Similar to -S, just the argument is differentin that it doesn’t search for a specific string but for a specificobject id.The. Diff r / Delayed by Ga l Segalen different voices, released 1. Diff r / Delayed 1 2. Diff r / Delayed 2 3. Diff r / Delayed 3 Excerpts. FieldHow to Use 'diff' Function in R - Dive into the 'diff' func - SQLPad
Are not affected by this setting. diff.mnemonicPrefix If set, git diff uses a prefix pair that is different from thestandard "a/" and "b/" depending on what is being compared. Whenthis configuration is in effect, reverse diff output also swapsthe order of the prefixes: git diff compares the (i)ndex and the (w)ork tree; git diff HEAD compares a (c)ommit and the (w)ork tree; git diff --cached compares a (c)ommit and the (i)ndex; git diff HEAD:file1 file2 compares an (o)bject and a (w)ork tree entity; git diff --no-index a b compares two non-git things (1) and (2). diff.noprefix If set, git diff does not show any source or destination prefix. diff.orderFile File indicating how to order files within a diff.See the -O option to git-diff[1] for details.If diff.orderFile is a relative pathname, it is treated asrelative to the top of the working tree. diff.renameLimit The number of files to consider when performing the copy/renamedetection; equivalent to the git diff option -l. This settinghas no effect if rename detection is turned off. diff.renames Whether and how Git detects renames. If set to "false",rename detection is disabled. If set to "true", basic renamedetection is enabled. If set to "copies" or "copy", Git willdetect copies, as well. Defaults to true. Note that thisaffects only git diff Porcelain like git-diff[1] andgit-log[1], and not lower level commands such asgit-diff-files[1]. diff.suppressBlankEmpty A boolean to inhibit the standard behavior of printing a spacebefore each empty output line. Defaults to false. diff.submodule Specify the format in which differences in submodules areshown. The "short" format just shows the names of the commitsat the beginning and end of the range. The "log" format liststhe commits in the range like git-submodule[1] summarydoes. The "diff" format shows an inline diff of the changedcontents of the submodule. Defaults to "short". diff.wordRegex A POSIX Extended Regular Expression used to determine what is a "word"when performing word-by-word difference calculations. Charactersequences that match the regular expression are "words", all othercharacters are ignorable whitespace. diff..command The custom diff driver command. See gitattributes[5]for details. diff..xfuncname The regular expression that the diff driver should use torecognize the hunk header. A built-in pattern may also be used.See gitattributes[5] for details. diff..binary Set this option to true to make the diff driver treat files asbinary. See gitattributes[5] for details. diff..textconv The command that the diff driver should call to generate thetext-converted version of a file. The result of theconversion is used to generate a human-readable diff. Seegitattributes[5] for details. diff..wordRegex The regular expression that the diff driver should use tosplit words in a line. See gitattributes[5] fordetails. diff..cachetextconv Set this option to true to make the diff driver cache the textconversion outputs. See gitattributes[5] for details. diff.tool Controls which diff tool is usedComments
By default, git log does not generate any diff output. The optionsbelow can be used to show the changes made by each commit.Note that unless one of --diff-merges variants (including short-m, -c, --cc, and --dd options) is explicitly given, merge commitswill not show a diff, even if a diff format like --patch isselected, nor will they match search options like -S. The exceptionis when --first-parent is in use, in which case first-parent isthe default format for merge commits. -p -u --patch Generate patch (see Generating patch text with -p). -s --no-patch Suppress all output from the diff machinery. Useful forcommands like git show that show the patch by default tosquelch their output, or to cancel the effect of options like--patch, --stat earlier on the command line in an alias. -m Show diffs for merge commits in the default format. This issimilar to --diff-merges=on, except -m willproduce no output unless -p is given as well. -c Produce combined diff output for merge commits.Shortcut for --diff-merges=combined -p. --cc Produce dense combined diff output for merge commits.Shortcut for --diff-merges=dense-combined -p. --dd Produce diff with respect to first parent for both merge andregular commits.Shortcut for --diff-merges=first-parent -p. --remerge-diff Produce remerge-diff output for merge commits.Shortcut for --diff-merges=remerge -p. --no-diff-merges Synonym for --diff-merges=off. --diff-merges= Specify diff format to be used for merge commits. Default is`off` unless --first-parent is in use, inwhich case first-parent is the default.The following formats are supported: off, none Disable output of diffs for merge commits. Useful to overrideimplied value. on, m Make diff output for merge commits to be shown in the defaultformat. The default format can be changed usinglog.diffMerges configuration variable, whose default valueis separate. first-parent, 1 Show full diff with respect to first parent. This is the sameformat as --patch produces for non-merge commits. separate Show full diff with respect to each of parents.Separate log entry and diff is generated for each parent. combined, c Show differences from each of the parents to the mergeresult simultaneously instead of showing pairwise diff betweena parent and the result one at a time. Furthermore, it listsonly files which were modified from all parents. dense-combined, cc Further compress output produced by --diff-merges=combinedby omitting uninteresting hunks whose contents in the parentshave only two variants and the merge result picks one of themwithout modification. remerge, r Remerge two-parent merge commits to create a temporary treeobject—potentially containing files with conflict markersand such. A diff is then shown
2025-04-13Diagnostic messages.OUTPUT FILES None.EXTENDED DESCRIPTION None.EXIT STATUS The following exit values shall be returned: 0 No differences were found. 1 Differences were found. >1 An error occurred.CONSEQUENCES OF ERRORS Default. The following sections are informative.APPLICATION USAGE If lines at the end of a file are changed and other lines are added, diff output may show this as a delete and add, as a change, or as a change and add; diff is not expected to know which happened and users should not care about the difference in output as long as it clearly shows the differences between the files.EXAMPLES If dir1 is a directory containing a directory named x, dir2 is a directory containing a directory named x, dir1/x and dir2/x both contain files named date.out, and dir2/x contains a file named y, the command: diff -r dir1 dir2 could produce output similar to: Common subdirectories: dir1/x and dir2/x Only in dir2/x: y diff -r dir1/x/date.out dir2/x/date.out 1c1 Mon Jul 2 13:12:16 PDT 1990 --- > Tue Jun 19 21:41:39 PDT 1990RATIONALE The -h option was omitted because it was insufficiently specified and does not add to applications portability. Historical implementations employ algorithms that do not always produce a minimum list of differences; the current language about making every effort is the best this volume of IEEE Std 1003.1-2001 can do, as there is no metric that could be employed to judge the quality of implementations against any and all file contents. The statement "This list should be minimal'' clearly implies that implementations are not expected to provide the following output when comparing two 100-line files that differ in only one character on a single line: 1,100c1,100 all 100 lines from file1 preceded with " " --- all 100 lines from file2 preceded with "> " The "Only in" messages required when the -r option is specified are not used by most historical implementations if the -e option is also specified. It is required here because it provides useful information that must be provided to update a target directory hierarchy to match a source hierarchy. The "Common subdirectories" messages are written by System V and 4.3 BSD when the -r option is specified. They are allowed here but are not required because they are reporting on something that is the same, not reporting a difference, and are not needed to update a target hierarchy. The -c option, which writes output
2025-04-17Files in some circumstances, even though they have the same name, is based on the actual output of historical implementations. The message specified here is already in use when a directory is being compared to a non-directory. It is extended here to preclude the problems arising from running into FIFOs and other files that would cause diff to hang waiting for input with no indication to the user that diff was hung. In most common usage, diff -r should indicate differences in the file hierarchies, not the difference of contents of devices pointed to by the hierarchies. Many early implementations of diff require seekable files. Since the System Interfaces volume of IEEE Std 1003.1-2001 supports named pipes, the standard developers decided that such a restriction was unreasonable. Note also that the allowed filename - almost always refers to a pipe. No directory search order is specified for diff. The historical ordering is, in fact, not optimal, in that it prints out all of the differences at the current level, including the statements about all common subdirectories before recursing into those subdirectories. The message: "diff %s %s %s\n", diff_options>, filename1>, filename2> does not vary by locale because it is the representation of a command, not an English sentence.FUTURE DIRECTIONS None.SEE ALSO cmp , comm , ed , findCOPYRIGHT Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at .
2025-03-29Provided by: manpages-posix_2.16-1_all NAME diff - compare two filesSYNOPSIS diff [-c| -e| -f| -C n][-br] file1 file2DESCRIPTION The diff utility shall compare the contents of file1 and file2 and write to standard output a list of changes necessary to convert file1 into file2. This list should be minimal. No output shall be produced if the files are identical.OPTIONS The diff utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines. The following options shall be supported: -b Cause any amount of white space at the end of a line to be treated as a single (that is, the white-space characters preceding the are ignored) and other strings of white-space characters, not including s, to compare equal. -c Produce output in a form that provides three lines of context. -C n Produce output in a form that provides n lines of context (where n shall be interpreted as a positive decimal integer). -e Produce output in a form suitable as input for the ed utility, which can then be used to convert file1 into file2. -f Produce output in an alternative form, similar in format to -e, but not intended to be suitable as input for the ed utility, and in the opposite order. -r Apply diff recursively to files and directories of the same name when file1 and file2 are both directories.OPERANDS The following operands shall be supported: file1, file2 A pathname of a file to be compared. If either the file1 or file2 operand is '-' , the standard input shall be used in its place. If both file1 and file2 are directories, diff shall not compare block special files, character special files, or FIFO special files to any files and shall not compare regular files to directories. Further details are as specified in Diff Directory Comparison Format . The behavior of diff on other file types is implementation-defined when found in directories. If only one of file1 and file2 is a directory, diff shall be applied to the non-directory file and the file contained in the directory file with a filename that is the same as the last component of the non- directory file.STDIN The standard input shall be used only if one of the file1 or file2 operands references standard input. See the INPUT FILES section.INPUT FILES The input files may be of any type.ENVIRONMENT VARIABLES The following environment variables
2025-04-21In a format using lines of context, has been included. The format is useful for a variety of reasons, among them being much improved readability and the ability to understand difference changes when the target file has line numbers that differ from another similar, but slightly different, copy. The patch utility is most valuable when working with difference listings using the context format. The BSD version of -c takes an optional argument specifying the amount of context. Rather than overloading -c and breaking the Utility Syntax Guidelines for diff, the standard developers decided to add a separate option for specifying a context diff with a specified amount of context ( -C). Also, the format for context diffs was extended slightly in 4.3 BSD to allow multiple changes that are within context lines from each other to be merged together. The output format contains an additional four asterisks after the range of affected lines in the first filename. This was to provide a flag for old programs (like old versions of patch) that only understand the old context format. The version of context described here does not require that multiple changes within context lines be merged, but it does not prohibit it either. The extension is upwards-compatible, so any vendors that wish to retain the old version of diff can do so by adding the extra four asterisks (that is, utilities that currently use diff and understand the new merged format will also understand the old unmerged format, but not vice versa). The substitute command was added as an additional format for the -e option. This was added to provide implementations with a way to fix the classic "dot alone on a line" bug present in many versions of diff. Since many implementations have fixed this bug, the standard developers decided not to standardize broken behavior, but rather to provide the necessary tool for fixing the bug. One way to fix this bug is to output two periods whenever a lone period is needed, then terminate the append command with a period, and then use the substitute command to convert the two periods into one period. The BSD-derived -r option was added to provide a mechanism for using diff to compare two file system trees. This behavior is useful, is standard practice on all BSD-derived systems, and is not easily reproducible with the find utility. The requirement that diff not compare
2025-04-15I am trying to initialize a 2D concurrent_hash_map, a container available in the Intel TBB library. Compilation passes and there is no error at runtime. However, not all initialized values are available in the container leading to incorrect behavior.The hash map is defined as[cpp]templatestruct MyHashCompare { static size_t hash(const K& key) { return boost::hash_value(key); } static bool equal(const K& key1, const K& key2) { return (key1 == key2); }};typedef concurrent_hash_map > ColMap;typedef concurrent_hash_map > RowMap;[/cpp]The function object is defined as follows. Could the reason for the incorrect behavior originate here?[cpp]class ColumnInit { RowMap *const pMyEdgeMap; public: void operator()(const blocked_range& r) const { RowMap* pEdgeMap = pMyEdgeMap; RowMap::accessor accessX; ColMap::accessor accessY; for(size_t n1 = r.begin(); n1 != r.end(); n1++) { pEdgeMap->insert(accessX, n1); for(int n2 = 1; n2 { int diff = abs((int)n1 - n2); if ((diff == 8) || (diff == 1)) { assert((accessX->second).insert(accessY, n2)); accessY->second = -1; } else { assert((accessX->second).insert(accessY, n2)); accessY->second = 0; } } } } ColumnInit(RowMap* pEdgeMap): pMyEdgeMap(pEdgeMap) { }};[/cpp]The function object is invoked from a call to parallel_for as follows:[cpp]parallel_for(blocked_range(1,64,16), ColumnInit((RowMap*)&mEdges), simple_partitioner());[/cpp]Any suggestions or feedback would be great.Thanks.
2025-04-03