Grep

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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.

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