grep command

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grep --help

Usage: grep [OPTION]... PATTERN [FILE] ...

Search for PATTERN in each FILE or standard input.

Example: grep -i 'hello world' menu.h main.c

Regexp selection and interpretation:

  -E, --extended-regexp     PATTERN is an extended regular expression

  -F, --fixed-strings       PATTERN is a set of newline-separated strings

  -G, --basic-regexp        PATTERN is a basic regular expression

  -P, --perl-regexp         PATTERN is a Perl regular expression

  -e, --regexp=PATTERN      use PATTERN as a regular expression

  -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             print version information and exit

      --help                display this help and exit

      --mmap                use memory-mapped input if possible

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 filename for each match

  -h, --no-filename         suppress the prefixing filename on output

      --label=LABEL         print LABEL as filename for standard input

  -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, -r, --recursive       equivalent to --directories=recurse

      --include=PATTERN     files that match PATTERN will be examined

      --exclude=PATTERN     files that match PATTERN will be skipped.

      --exclude-from=FILE   files that match PATTERN in FILE will be skipped.

  -L, --files-without-match only print FILE names containing no match

  -l, --files-with-matches  only print FILE names containing matches

  -c, --count               only print a count of matching lines per FILE

  -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

      --color[=WHEN],

      --colour[=WHEN]       use markers to distinguish the matching string

                            WHEN may be `always', `never' or `auto'.

  -U, --binary              do not strip CR characters at EOL (MSDOS)

  -u, --unix-byte-offsets   report offsets as if CRs were not there (MSDOS)

`egrep' means `grep -E'.  `fgrep' means `grep -F'.

With no FILE, or when FILE is -, read standard input.  If less than

two FILEs given, assume -h.  Exit status is 0 if match, 1 if no match,

and 2 if trouble.