The two, treat it as present but empty in the other. P When comparing directories, if a file appears only in the second directory of p Show which C function each change is in. Use format to output a line taken from just the first file in if-then-else format. Use format to output a group of lines taken from just the first file in Use format to output a line taken from just the second file in if-then-else format. Use format to output a group of lines taken from just the second file in Present but empty in the other directory. In directory comparison, if a file is found in only one directory, treat it as n Output RCS-format diffs like -f except that each command specifies the number of Use format to output all input lines in in-then-else format.Ĭhange the algorithm to perhaps find a smaller set of changes. Print only the left column of two common lines in side by side format. Use label instead of the file name in the context format and unified format headers. l Pass the output through pr to paginate it. This causes the alignment of tabs in the line to look normal. Output a tab rather than a space before the text of a line in normal or context format. Ignore changes in case consider upper- and lower-case to be the same. Ignore changes that just insert or delete blank lines. Ignore changes that just insert or delete lines that match regexp. i Ignore changes in case consider upper- and lower-case letters equivalent. H Use heuristics to speed handling of large files that have numerous scattered small changes.ĭo not discard the last lines lines of the common prefix and the first lines h This option currently has no effect it is present for Unix compatibility. Make output that looks vaguely like an ed script but has changes in the order they appear In context and unified format, for each hunk of differences, show some of the last f Make output that looks vaguely like an ed script but has changes in the order When comparing directories, ignore files and subdirectories whose basenamesĮxpand tabs to spaces in the output, to preserve the alignment of tabs in the input files. When comparing directories, ignore files and subdirectories whose basenames match pattern. ed Make output that is a valid ed script. Make merged if-then-else format output, conditional on the preprocessor macro name. This makes diff slower (sometimes much slower). d Change the algorithm to perhaps find a smaller set of changes. Use format to output a line group containing differing lines from both files For proper operation, patch typically needs Use the context output format, showing lines (an integer) lines of context, Report only whether the files differ, not the details of the differences. B Ignore changes that just insert or delete blank lines. b Ignore changes in amount of white space. a Treat all files as text and compare them line-by-line, even if they do not seem to be text. Multiple single letter options (unless they take an argument) can be combined into a single command-line word: so `-ac' is equivalent to `-a -c'. Display the differences between two files, or each corresponding file in two directories.Įach set of differences is called a "diff" or "patch".įor files that are identical, 'diff' normally produces no output for binary (non-text) files, 'diff' normally reports only that they are different.
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