grep --help

安宇雨
2018-10-23 15:02:49
操作系统
centos

[root@localhost linjinyu]# grep --help
Usage: grep [OPTION]... PATTERN [FILE]...
Search for PATTERN in each FILE or standard input.
PATTERN is, by default, a basic regular expression (BRE).
Example: grep -i 'hello world' menu.h main.c

Regexp selection and interpretation:
-E, --extended-regexp PATTERN is an extended regular expression (ERE)
-F, --fixed-strings PATTERN is a set of newline-separated fixed strings
-G, --basic-regexp PATTERN is a basic regular expression (BRE)
-P, --perl-regexp PATTERN is a Perl regular expression
-e, --regexp=PATTERN use PATTERN for matching
-f, --file=FILE obtain PATTERN from FILE
-i, --ignore-case ignore case distinctions
-w, --word-regexp force PATTERN to match only whole words
-x, --line-regexp force PATTERN to match only whole lines
-z, --null-data a data line ends in 0 byte, not newline

Miscellaneous:
-s, --no-messages suppress error messages
-v, --invert-match select non-matching lines
-V, --version display version information and exit

  --help                display this help text and exit

Output control:
-m, --max-count=NUM stop after NUM matches
-b, --byte-offset print the byte offset with output lines
-n, --line-number print line number with output lines

  --line-buffered       flush output on every line

-H, --with-filename print the file name for each match
-h, --no-filename suppress the file name prefix on output

  --label=LABEL         use LABEL as the standard input file name prefix

-o, --only-matching show only the part of a line matching PATTERN
-q, --quiet, --silent suppress all normal output

  --binary-files=TYPE   assume that binary files are TYPE;
                        TYPE is 'binary', 'text', or 'without-match'

-a, --text equivalent to --binary-files=text
-I equivalent to --binary-files=without-match
-d, --directories=ACTION how to handle directories;

                        ACTION is 'read', 'recurse', or 'skip'

-D, --devices=ACTION how to handle devices, FIFOs and sockets;

                        ACTION is 'read' or 'skip'

-r, --recursive like --directories=recurse
-R, --dereference-recursive

                        likewise, but follow all symlinks
  --include=FILE_PATTERN
                        search only files that match FILE_PATTERN
  --exclude=FILE_PATTERN
                        skip files and directories matching FILE_PATTERN
  --exclude-from=FILE   skip files matching any file pattern from FILE
  --exclude-dir=PATTERN directories that match PATTERN will be skipped.

-L, --files-without-match print only names of FILEs containing no match
-l, --files-with-matches print only names of FILEs containing matches
-c, --count print only a count of matching lines per FILE
-T, --initial-tab make tabs line up (if needed)
-Z, --null print 0 byte after FILE name

Context control:
-B, --before-context=NUM print NUM lines of leading context
-A, --after-context=NUM print NUM lines of trailing context
-C, --context=NUM print NUM lines of output context
-NUM same as --context=NUM

  --group-separator=SEP use SEP as a group separator
  --no-group-separator  use empty string as a group separator
  --color[=WHEN],
  --colour[=WHEN]       use markers to highlight the matching strings;
                        WHEN is 'always', 'never', or 'auto'

-U, --binary do not strip CR characters at EOL (MSDOS/Windows)
-u, --unix-byte-offsets report offsets as if CRs were not there

                        (MSDOS/Windows)

'egrep' means 'grep -E'. 'fgrep' means 'grep -F'.
Direct invocation as either 'egrep' or 'fgrep' is deprecated.
When FILE is -, read standard input. With no FILE, read . if a command-line
-r is given, - otherwise. If fewer than two FILEs are given, assume -h.
Exit status is 0 if any line is selected, 1 otherwise;
if any error occurs and -q is not given, the exit status is 2.

Report bugs to: bug-grep@gnu.org
GNU Grep home page: http://www.gnu.org/software/grep/
General help using GNU software: http://www.gnu.org/gethelp/

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