Mandatory
arguments to long options are mandatory for short options too.
--normal output a normal diff (the default)
-q, --
brief report only when files differ
-s, --report
-ident
ical-files report when two files are the same
-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
-e, --ed output an ed script
-n, --rcs output an RCS format diff
-y, --side-by-side output in two columns
FILES 的格式可以是‘FILE1 FILE2'、‘DIR1 DIR2'、‘DIR FILE
...'或
‘FILE... DIR'。
用法:diff [选项]... FILES
Compare FILES line by line.
Mandatory
arguments to long options are mandatory for short options too.
--normal output a normal diff (the default)
-q, --brief report only when files differ
-s, --report-identical-files report when two files are the same
-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
-e, --ed output an ed script
-n, --rcs output an RCS format diff
-y, --side-by-side output in two columns
-W, --width=NUM output at most NUM (default 130)
PRint columns
--left-column output only the left column of common lines
--sup
Press-common-lines do not output common lines
-p, --show-c-function show
which C function
each change is in
-F, --show-function-line=RE show the most recent line matching RE
--label LABEL use LABEL instead of file name
(can be re
PEated)
-t, --e
xpand-tabs expand tabs to spaces in output
-T, --in
ITial-tab make tabs line up by prepending a tab
--tabsize=NUM tab stops every NUM (default 8) print columns
--suppress-blank-empty suppress space or tab before empty output lines
-l, --pa
ginate pass output t
hrough `pr' to paginate it
-r, --recursive recursively compare any s
ubdirectories found
-N, --new-file treat absent files as empty
--unidirectional-new-file treat absent
First files as empty
--ignore-file-name-case ignore case when comparing file
names
--no-ignore-file-name-case consider case when comparing file names
-x, --exclude=PAT exclude files t
hat match PAT
-X, --exclude-
From=FILE exclude files that match any pattern in FILE
-S, --starting-file=FILE start with FILE when comparing directories
--f
rom-file=FILE1 compare FILE1 to all
operands;
FILE1 can be a directory
--to-file=FILE2 compare all operands to FILE2;
FILE2 can be a directory
-i, --ignore-case ignore case differences in file contents
-E, --ignore-tab-expansion ignore changes due to tab expansion
-Z, --ignore-tr
ailing-space ignore white space at line end
-b, --ignore-space-change ignore changes in the a
mount of white space
-w, --ignore-all-space ignore all white space
-B, --ignore-blank-lines ignore changes whose lines are all blank
-I, --ignore-matching-lines=RE ignore changes whose lines all match RE
-a, --text treat all files as text
--strip-trailing-cr strip trailing carriage return on input
-D, --ifdef=NAME output merged file with `
#ifdef NAME' diffs
--GTYPE-group-format=GFMT format GTYPE input groups with GFMT
--line-format=LFMT format all input lines with LFMT
--LTYPE-line-format=LFMT format LTYPE input lines with LFMT
These format options provide fine-grained control over the output
of diff, generalizing -D/--ifdef.
LTYPE 可以是‘old'、‘new'或‘unchanged'。GTYPE 可以是 LTYPE 的选择
或是‘changed'。
GFMT (only) may contain:
%< lines from FILE1
%> lines from FILE2
%= lines common to FILE1 and FILE2
%[-][WIDTH][.[PREC]]{doxX}LETTER 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
%(A=B?T:E) if A equals B then T else E
LFMT (only) may contain:
%L contents of line
%l contents of line, excluding any trailing newline
%[-][WIDTH][.[PREC]]{doxX}n printf-style spec for input line number
Both GFMT and LFMT may contain:
%% %
%c'C' the single character C
%c'\OOO' the character with octal code OOO
C the character C (other characters represent themselves)
-d, --minimal try hard to find a smaller set of changes
--horizon-lines=NUM keep NUM lines of the common prefix and suffix
--speed-large-files assume large files and many scatte
red small changes
--help dis
play this help and exit
-v, --version output version information and exit
FILES 的格式可以是‘FILE1 FILE2'、‘DIR1 DIR2'、‘DIR FILE...'或
‘FILE... DIR'。
If --from-file or --to-file is given, there are no restrictions on FILE(s).
如果 FILE 是‘-',则由标准输入读取内容。
如果输入相同,则退出状态为 0;1 表示输入不同;2 表示有错误产生。