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Grep

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Man page:grep

Syntax

shell

grep OPTIONS PATTERN FILE

Option	Description
`-r` `--recursive`	Recursive (when FILE is a FOLDER)
`-c` `--count`	Print a count of matching lines.
`-C` `--context` `-NUM`	Print `NUM` lines of output context.
`-v` `--invert-match`	Invert the sense of matching, to select non-matching lines.
`-o` `--only-matching`	Print only the matched (non-empty) parts of matching lines.
`-l` `--files-with-matches`	Show only the names of files that contain matches.
`-f` `--file`	Obtain patterns, one per line, from the given file. Use `-` for stdin.
`-E` `--extended-regexp`	Interpret PATTERN as extended regular expressions.
`-F` `--fixed-strings`	Interpret PATTERN as fixed strings.
`-m` `--max-count`	Stop reading a file after NUM matching lines.
`-P` `--perl-regexp`	Interpret patterns as Perl-compatible regular expressions (PCREs).
`-q` `--quiet` `--silent`	Do not write anything to STDOUT. Useful when only status code matters.
`--exclude`	Exclude FILEs

Recursive (with exclusions) grep.

shell

grep -r --exclude="*.swp" 'search_value' .

Search using extended regexp in a file.

shell

grep -Ev 'boo|foo' file

Obtain patterns from stdin.

shell

echo 'pattern' | grep -f - file

Find and replace all matches recursively in files:

shell

grep --files-with-matches foo | xargs -n 1 sed -i 's/foo/boo/g'