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DIFF(1)				 User Commands			       DIFF(1)

       diff - compare files line by line

       diff [OPTION]...	FILES

       Compare files line by line.

       -i  --ignore-case
	      Ignore case differences in file contents.

	      Ignore case when comparing file names.

	      Consider case when comparing file	names.

       -E  --ignore-tab-expansion
	      Ignore changes due to tab	expansion.

       -b  --ignore-space-change
	      Ignore changes in	the amount of white space.

       -w  --ignore-all-space
	      Ignore all white space.

       -B  --ignore-blank-lines
	      Ignore changes whose lines are all blank.

       -I RE  --ignore-matching-lines=RE
	      Ignore changes whose lines all match RE.

	      Strip trailing carriage return on	input.

       -a  --text
	      Treat all	files as text.

       -c  -C NUM  --context[=NUM]
	      Output NUM (default 3) lines of copied context.

       -u  -U NUM  --unified[=NUM]
	      Output NUM (default 3) lines of unified context.

       --label LABEL
	      Use LABEL	instead	of file	name.

       -p  --show-c-function
	      Show which C function each change	is in.

       -F RE  --show-function-line=RE
	      Show the most recent line	matching RE.

       -q  --brief
	      Output only whether files	differ.

       -e  --ed
	      Output an	ed script.

	      Output a normal diff.

       -n  --rcs
	      Output an	RCS format diff.

       -y  --side-by-side
	      Output in	two columns.

       -W NUM  --width=NUM
	      Output at	most NUM (default 130) print columns.

	      Output only the left column of common lines.

	      Do not output common lines.

       -D NAME	--ifdef=NAME
	      Output merged file to show `#ifdef NAME' diffs.

	      Similar, but format GTYPE	input groups with GFMT.

	      Similar, but format all input lines with LFMT.

	      Similar, but format LTYPE	input lines with LFMT.

       LTYPE is	`old', `new', or `unchanged'.
	      GTYPE is LTYPE or	`changed'.

	      GFMT may contain:

       %<     lines from FILE1

       %>     lines from FILE2

       %=     lines common to FILE1 and	FILE2

	      printf-style spec	for LETTER

	      LETTERs are as follows for new group, lower case for old group:

       F      first line number

       L      last line	number

       N      number of	lines =	L-F+1

       E      F-1

       M      L+1

	      LFMT may contain:

       %L     contents of line

       %l     contents of line,	excluding any trailing newline

	      printf-style spec	for input line number

	      Either GFMT or LFMT may contain:

       %%     %

       %c'C'  the single character C

	      the character with octal code OOO

       -l  --paginate
	      Pass the output through `pr' to paginate it.

       -t  --expand-tabs
	      Expand tabs to spaces in output.

       -T  --initial-tab
	      Make tabs	line up	by prepending a	tab.

	      Tab stops	are every NUM (default 8) print	columns.

	      Suppress space or	tab before empty output	lines.

       -r  --recursive
	      Recursively compare any subdirectories found.

       -N  --new-file
	      Treat absent files as empty.

	      Treat absent first files as empty.

       -s  --report-identical-files
	      Report when two files are	the same.

       -x PAT  --exclude=PAT
	      Exclude files that match PAT.

       -X FILE	--exclude-from=FILE
	      Exclude files that match any pattern in FILE.

       -S FILE	--starting-file=FILE
	      Start with FILE when comparing directories.

	      Compare FILE1 to all operands.  FILE1 can	be a directory.

	      Compare all operands to FILE2.  FILE2 can	be a directory.

	      Keep NUM lines of	the common prefix and suffix.

       -d  --minimal
	      Try hard to find a smaller set of	changes.

	      Assume large files and many scattered small changes.

       -v  --version
	      Output version info.

       --help Output this help.

       FILES  are  `FILE1  FILE2'  or `DIR1 DIR2' or `DIR FILE...' or `FILE...
       DIR'.  If --from-file or	--to-file is given, there are no  restrictions
       on  FILES.  If a	FILE is	`-', read standard input.  Exit	status is 0 if
       inputs are the same, 1 if different, 2 if trouble.

       Written by Paul Eggert, Mike Haertel, David  Hayes,  Richard  Stallman,
       and Len Tower.

       Report bugs to <>.

       Copyright  (C) 2007 Free	Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or	later <>
       This is free software: you are free  to	change	and  redistribute  it.
       There is	NO WARRANTY, to	the extent permitted by	law.

       The  full documentation for diff	is maintained as a Texinfo manual.  If
       the info	and diff programs are properly installed  at  your  site,  the

	      info diff

       should give you access to the complete manual.

diffutils 2.8.7-cvs		 January 2008			       DIFF(1)


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