CLI

Usage

grep [options] [pattern] [file ...]

Flags

Short	Long	Description
-r, -R	–recursive	Recursive
-v	–invert-match	Invert match
-i	–ignore-case	Case insensitive
-A NUM		Print num lines of training context
-G	–basic-regexp	Basic regex (default).
-E	–extended-regexp	Extended regex. Same as egrep.
-P	–perl-regexp	Perl regular expression.
-F	–fixed-strings	Same as fgrep.
-f PATH	–file PATH	Get patterns for file.
-h	–no-filename
-H	–with-filename
-l	–files-with-matches	Just print filenames.
-L	–files-without-match

Samples

Search recursively in current directory, case insenstively.

$ grep -ir PATTERN

Show filename.

$ grep -H foobar *
foo.txt:This is foobar
bar.txt:This is another match for the foobar pattern