| 1 | .\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.27.
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| 2 | .TH DIFF "1" "April 2002" "diffutils 2.8.1" "User Commands"
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| 3 | .SH NAME
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| 4 | diff \- compare files line by line
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| 5 | .SH SYNOPSIS
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| 6 | .B diff
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| 7 | [\fIOPTION\fR]... \fIFILES\fR
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| 8 | .SH DESCRIPTION
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| 9 | Compare files line by line.
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| 10 | .TP
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| 11 | \fB\-i\fR \fB\-\-ignore\-case\fR
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| 12 | Ignore case differences in file contents.
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| 13 | .TP
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| 14 | \fB\-\-ignore\-file\-name\-case\fR
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| 15 | Ignore case when comparing file names.
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| 16 | .TP
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| 17 | \fB\-\-no\-ignore\-file\-name\-case\fR
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| 18 | Consider case when comparing file names.
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| 19 | .TP
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| 20 | \fB\-E\fR \fB\-\-ignore\-tab\-expansion\fR
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| 21 | Ignore changes due to tab expansion.
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| 22 | .TP
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| 23 | \fB\-b\fR \fB\-\-ignore\-space\-change\fR
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| 24 | Ignore changes in the amount of white space.
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| 25 | .TP
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| 26 | \fB\-w\fR \fB\-\-ignore\-all\-space\fR
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| 27 | Ignore all white space.
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| 28 | .TP
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| 29 | \fB\-B\fR \fB\-\-ignore\-blank\-lines\fR
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| 30 | Ignore changes whose lines are all blank.
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| 31 | .TP
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| 32 | \fB\-I\fR RE \fB\-\-ignore\-matching\-lines\fR=\fIRE\fR
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| 33 | Ignore changes whose lines all match RE.
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| 34 | .TP
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| 35 | \fB\-\-strip\-trailing\-cr\fR
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| 36 | Strip trailing carriage return on input.
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| 37 | .TP
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| 38 | \fB\-a\fR \fB\-\-text\fR
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| 39 | Treat all files as text.
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| 40 | .TP
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| 41 | \fB\-c\fR \fB\-C\fR NUM \fB\-\-context\fR[=\fINUM\fR]
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| 42 | Output NUM (default 3) lines of copied context.
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| 43 | .TP
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| 44 | \fB\-u\fR \fB\-U\fR NUM \fB\-\-unified\fR[=\fINUM\fR]
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| 45 | Output NUM (default 3) lines of unified context.
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| 46 | .TP
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| 47 | \fB\-\-label\fR LABEL
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| 48 | Use LABEL instead of file name.
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| 49 | .TP
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| 50 | \fB\-p\fR \fB\-\-show\-c\-function\fR
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| 51 | Show which C function each change is in.
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| 52 | .TP
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| 53 | \fB\-F\fR RE \fB\-\-show\-function\-line\fR=\fIRE\fR
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| 54 | Show the most recent line matching RE.
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| 55 | .TP
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| 56 | \fB\-q\fR \fB\-\-brief\fR
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| 57 | Output only whether files differ.
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| 58 | .TP
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| 59 | \fB\-e\fR \fB\-\-ed\fR
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| 60 | Output an ed script.
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| 61 | .TP
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| 62 | \fB\-\-normal\fR
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| 63 | Output a normal diff.
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| 64 | .TP
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| 65 | \fB\-n\fR \fB\-\-rcs\fR
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| 66 | Output an RCS format diff.
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| 67 | .TP
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| 68 | \fB\-y\fR \fB\-\-side\-by\-side\fR
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| 69 | Output in two columns.
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| 70 | .TP
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| 71 | \fB\-W\fR NUM \fB\-\-width\fR=\fINUM\fR
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| 72 | Output at most NUM (default 130) print columns.
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| 73 | .TP
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| 74 | \fB\-\-left\-column\fR
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| 75 | Output only the left column of common lines.
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| 76 | .TP
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| 77 | \fB\-\-suppress\-common\-lines\fR
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| 78 | Do not output common lines.
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| 79 | .TP
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| 80 | \fB\-D\fR NAME \fB\-\-ifdef\fR=\fINAME\fR
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| 81 | Output merged file to show `#ifdef NAME' diffs.
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| 82 | .TP
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| 83 | \fB\-\-GTYPE\-group\-format\fR=\fIGFMT\fR
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| 84 | Similar, but format GTYPE input groups with GFMT.
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| 85 | .TP
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| 86 | \fB\-\-line\-format\fR=\fILFMT\fR
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| 87 | Similar, but format all input lines with LFMT.
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| 88 | .TP
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| 89 | \fB\-\-LTYPE\-line\-format\fR=\fILFMT\fR
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| 90 | Similar, but format LTYPE input lines with LFMT.
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| 91 | .TP
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| 92 | LTYPE is `old', `new', or `unchanged'.
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| 93 | GTYPE is LTYPE or `changed'.
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| 94 | .IP
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| 95 | GFMT may contain:
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| 96 | .TP
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| 97 | %<
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| 98 | lines from FILE1
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| 99 | .TP
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| 100 | %>
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| 101 | lines from FILE2
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| 102 | .TP
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| 103 | %=
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| 104 | lines common to FILE1 and FILE2
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| 105 | .TP
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| 106 | %[-][WIDTH][.[PREC]]{doxX}LETTER
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| 107 | printf-style spec for LETTER
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| 108 | .IP
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| 109 | LETTERs are as follows for new group, lower case for old group:
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| 110 | .TP
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| 111 | F
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| 112 | first line number
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| 113 | .TP
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| 114 | L
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| 115 | last line number
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| 116 | .TP
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| 117 | N
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| 118 | number of lines = L-F+1
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| 119 | .TP
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| 120 | E
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| 121 | F-1
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| 122 | .TP
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| 123 | M
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| 124 | L+1
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| 125 | .IP
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| 126 | LFMT may contain:
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| 127 | .TP
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| 128 | %L
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| 129 | contents of line
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| 130 | .TP
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| 131 | %l
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| 132 | contents of line, excluding any trailing newline
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| 133 | .TP
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| 134 | %[-][WIDTH][.[PREC]]{doxX}n
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| 135 | printf-style spec for input line number
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| 136 | .IP
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| 137 | Either GFMT or LFMT may contain:
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| 138 | .TP
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| 139 | %%
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| 140 | %
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| 141 | .TP
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| 142 | %c'C'
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| 143 | the single character C
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| 144 | .TP
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| 145 | %c'\eOOO'
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| 146 | the character with octal code OOO
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| 147 | .TP
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| 148 | \fB\-l\fR \fB\-\-paginate\fR
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| 149 | Pass the output through `pr' to paginate it.
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| 150 | .TP
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| 151 | \fB\-t\fR \fB\-\-expand\-tabs\fR
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| 152 | Expand tabs to spaces in output.
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| 153 | .TP
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| 154 | \fB\-T\fR \fB\-\-initial\-tab\fR
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| 155 | Make tabs line up by prepending a tab.
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| 156 | .TP
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| 157 | \fB\-r\fR \fB\-\-recursive\fR
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| 158 | Recursively compare any subdirectories found.
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| 159 | .TP
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| 160 | \fB\-N\fR \fB\-\-new\-file\fR
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| 161 | Treat absent files as empty.
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| 162 | .TP
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| 163 | \fB\-\-unidirectional\-new\-file\fR
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| 164 | Treat absent first files as empty.
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| 165 | .TP
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| 166 | \fB\-s\fR \fB\-\-report\-identical\-files\fR
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| 167 | Report when two files are the same.
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| 168 | .TP
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| 169 | \fB\-x\fR PAT \fB\-\-exclude\fR=\fIPAT\fR
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| 170 | Exclude files that match PAT.
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| 171 | .TP
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| 172 | \fB\-X\fR FILE \fB\-\-exclude\-from\fR=\fIFILE\fR
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| 173 | Exclude files that match any pattern in FILE.
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| 174 | .TP
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| 175 | \fB\-S\fR FILE \fB\-\-starting\-file\fR=\fIFILE\fR
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| 176 | Start with FILE when comparing directories.
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| 177 | .TP
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| 178 | \fB\-\-from\-file\fR=\fIFILE1\fR
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| 179 | Compare FILE1 to all operands. FILE1 can be a directory.
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| 180 | .TP
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| 181 | \fB\-\-to\-file\fR=\fIFILE2\fR
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| 182 | Compare all operands to FILE2. FILE2 can be a directory.
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| 183 | .TP
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| 184 | \fB\-\-horizon\-lines\fR=\fINUM\fR
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| 185 | Keep NUM lines of the common prefix and suffix.
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| 186 | .TP
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| 187 | \fB\-d\fR \fB\-\-minimal\fR
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| 188 | Try hard to find a smaller set of changes.
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| 189 | .TP
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| 190 | \fB\-\-speed\-large\-files\fR
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| 191 | Assume large files and many scattered small changes.
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| 192 | .TP
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| 193 | \fB\-v\fR \fB\-\-version\fR
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