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+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.36.
+.TH DIFF "1" "April 2010" "diffutils 2.9.19-4065" "User Commands"
+.SH NAME
+diff \- compare files line by line
+.SH SYNOPSIS
+.B diff
+[\fIOPTION\fR]... \fIFILES\fR
+.SH DESCRIPTION
+Compare files line by line.
+.TP
+\fB\-i\fR  \fB\-\-ignore\-case\fR
+Ignore case differences in file contents.
+.TP
+\fB\-\-ignore\-file\-name\-case\fR
+Ignore case when comparing file names.
+.TP
+\fB\-\-no\-ignore\-file\-name\-case\fR
+Consider case when comparing file names.
+.TP
+\fB\-E\fR  \fB\-\-ignore\-tab\-expansion\fR
+Ignore changes due to tab expansion.
+.TP
+\fB\-b\fR  \fB\-\-ignore\-space\-change\fR
+Ignore changes in the amount of white space.
+.TP
+\fB\-w\fR  \fB\-\-ignore\-all\-space\fR
+Ignore all white space.
+.TP
+\fB\-B\fR  \fB\-\-ignore\-blank\-lines\fR
+Ignore changes whose lines are all blank.
+.TP
+\fB\-I\fR RE  \fB\-\-ignore\-matching\-lines\fR=\fIRE\fR
+Ignore changes whose lines all match RE.
+.TP
+\fB\-\-strip\-trailing\-cr\fR
+Strip trailing carriage return on input.
+.TP
+\fB\-a\fR  \fB\-\-text\fR
+Treat all files as text.
+.TP
+\fB\-c\fR  \fB\-C\fR NUM  \fB\-\-context\fR[=\fINUM\fR]
+Output NUM (default 3) lines of copied context.
+.TP
+\fB\-u\fR  \fB\-U\fR NUM  \fB\-\-unified\fR[=\fINUM\fR]
+Output NUM (default 3) lines of unified context.
+.TP
+\fB\-\-label\fR LABEL
+Use LABEL instead of file name.
+.TP
+\fB\-p\fR  \fB\-\-show\-c\-function\fR
+Show which C function each change is in.
+.TP
+\fB\-F\fR RE  \fB\-\-show\-function\-line\fR=\fIRE\fR
+Show the most recent line matching RE.
+.TP
+\fB\-q\fR  \fB\-\-brief\fR
+Output only whether files differ.
+.TP
+\fB\-e\fR  \fB\-\-ed\fR
+Output an ed script.
+.TP
+\fB\-\-normal\fR
+Output a normal diff.
+.TP
+\fB\-n\fR  \fB\-\-rcs\fR
+Output an RCS format diff.
+.TP
+\fB\-y\fR  \fB\-\-side\-by\-side\fR
+Output in two columns.
+.TP
+\fB\-W\fR NUM  \fB\-\-width\fR=\fINUM\fR
+Output at most NUM (default 130) print columns.
+.TP
+\fB\-\-left\-column\fR
+Output only the left column of common lines.
+.TP
+\fB\-\-suppress\-common\-lines\fR
+Do not output common lines.
+.TP
+\fB\-D\fR NAME  \fB\-\-ifdef\fR=\fINAME\fR
+Output merged file to show `#ifdef NAME' diffs.
+.TP
+\fB\-\-GTYPE\-group\-format\fR=\fIGFMT\fR
+Similar, but format GTYPE input groups with GFMT.
+.TP
+\fB\-\-line\-format\fR=\fILFMT\fR
+Similar, but format all input lines with LFMT.
+.TP
+\fB\-\-LTYPE\-line\-format\fR=\fILFMT\fR
+Similar, but format LTYPE input lines with LFMT.
+.TP
+LTYPE is `old', `new', or `unchanged'.
+GTYPE is LTYPE or `changed'.
+.IP
+GFMT may contain:
+.TP
+%<
+lines from FILE1
+.TP
+%>
+lines from FILE2
+.TP
+%=
+lines common to FILE1 and FILE2
+.TP
+%[\-][WIDTH][.[PREC]]{doxX}LETTER
+printf\-style spec for LETTER
+.IP
+LETTERs are as follows for new group, lower case for old group:
+.TP
+F
+first line number
+.TP
+L
+last line number
+.TP
+N
+number of lines = L\-F+1
+.TP
+E
+F\-1
+.TP
+M
+L+1
+.IP
+LFMT may contain:
+.TP
+%L
+contents of line
+.TP
+%l
+contents of line, excluding any trailing newline
+.TP
+%[\-][WIDTH][.[PREC]]{doxX}n
+printf\-style spec for input line number
+.IP
+Either GFMT or LFMT may contain:
+.TP
+%%
+%
+.TP
+%c'C'
+the single character C
+.TP
+%c'\eOOO'
+the character with octal code OOO
+.TP
+\fB\-l\fR  \fB\-\-paginate\fR
+Pass the output through `pr' to paginate it.
+.TP
+\fB\-t\fR  \fB\-\-expand\-tabs\fR
+Expand tabs to spaces in output.
+.TP
+\fB\-T\fR  \fB\-\-initial\-tab\fR
+Make tabs line up by prepending a tab.
+.TP
+\fB\-\-tabsize\fR=\fINUM\fR
+Tab stops are every NUM (default 8) print columns.
+.TP
+\fB\-\-suppress\-blank\-empty\fR
+Suppress space or tab before empty output lines.
+.TP
+\fB\-r\fR  \fB\-\-recursive\fR
+Recursively compare any subdirectories found.
+.TP
+\fB\-N\fR  \fB\-\-new\-file\fR
+Treat absent files as empty.
+.TP
+\fB\-\-unidirectional\-new\-file\fR
+Treat absent first files as empty.
+.TP
+\fB\-s\fR  \fB\-\-report\-identical\-files\fR
+Report when two files are the same.
+.TP
+\fB\-x\fR PAT  \fB\-\-exclude\fR=\fIPAT\fR
+Exclude files that match PAT.
+.TP
+\fB\-X\fR FILE  \fB\-\-exclude\-from\fR=\fIFILE\fR
+Exclude files that match any pattern in FILE.
+.TP
+\fB\-S\fR FILE  \fB\-\-starting\-file\fR=\fIFILE\fR
+Start with FILE when comparing directories.
+.TP
+\fB\-\-from\-file\fR=\fIFILE1\fR
+Compare FILE1 to all operands.  FILE1 can be a directory.
+.TP
+\fB\-\-to\-file\fR=\fIFILE2\fR
+Compare all operands to FILE2.  FILE2 can be a directory.
+.TP
+\fB\-\-horizon\-lines\fR=\fINUM\fR
+Keep NUM lines of the common prefix and suffix.
+.TP
+\fB\-d\fR  \fB\-\-minimal\fR
+Try hard to find a smaller set of changes.
+.TP
+\fB\-\-speed\-large\-files\fR
+Assume large files and many scattered small changes.
+.TP
+\fB\-v\fR  \fB\-\-version\fR
+Output version info.
+.TP
+\fB\-\-help\fR
+Output this help.
+.PP
+FILES are `FILE1 FILE2' or `DIR1 DIR2' or `DIR FILE...' or `FILE... DIR'.
+If \fB\-\-from\-file\fR or \fB\-\-to\-file\fR 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.
+.SH AUTHOR
+Written by Paul Eggert, Mike Haertel, David Hayes,
+Richard Stallman, and Len Tower.
+.SH "REPORTING BUGS"
+Report bugs to: bug\-diffutils@gnu.org
+GNU diffutils home page: <http://www.gnu.org/software/diffutils/>
+General help using GNU software: <http://www.gnu.org/gethelp/>
+.SH COPYRIGHT
+Copyright \(co 2010 Free Software Foundation, Inc.
+License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
+.br
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+.SH "SEE ALSO"
+The full documentation for
+.B diff
+is maintained as a Texinfo manual.  If the
+.B info
+and
+.B diff
+programs are properly installed at your site, the command
+.IP
+.B info diff
+.PP
+should give you access to the complete manual.