SHELL

grep pattern options

-F, --fixed-strings   # list of fixed strings
-G, --basic-regexp    # basic regular expression (default)
-E, --extended-regexp # extended regular expression
-P, --perl-regexp     # perl compatible regular expression

grep Matching options

-e, --regexp=PATTERN
-f, --file=FILE
-i, --ignore-case
-v, --invert-match
-w, --word-regexp
-x, --line-regexp