grep(1) on Linux
The text 2f6e8242d095, as Debian 7 (Wheezy) shipped it.
print lines matching a pattern
Flags it lists
-
--basic-regexp -
--binary -
--binary-files -
--byte-offset -
--color -
--colour -
--count -
--exclude -
--exclude-dir -
--exclude-from -
--extended-regexp -
--files-with-matches -
--files-without-match -
--fixed-strings -
--help -
--ignore-case -
--include -
--initial-tab -
--invert-match -
--label -
--line-buffered -
--line-number -
--line-regexp -
--mmap -
--no-filename -
--no-messages -
--null -
--null-data -
--only-matching -
--perl-regexp -
--quiet -
--recursive -
--silent -
--text -
--unix-byte-offsets -
--version -
--with-filename -
--word-regexp -
-E -
-F -
-G -
-H -
-I -
-L -
-P -
-R -
-T -
-U -
-V -
-Z -
-a -
-b -
-c -
-h -
-i -
-l -
-n -
-o -
-q -
-r -
-s -
-u -
-v -
-w -
-x -
-y -
-z