docs:unix:grep [hartungdesign.net wiki]

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====== grep ======
http://www.gnu.org/software/grep/

===== Command line usage =====
<code>
grep [options] PATTERN [FILE...]
grep [options] [-e PATTERN | -f FILE] [FILE...]
</code>

===== Examples =====
|printenv <html>|</html> grep lib|print a list of environment variables that contain "lib"|
|grep -e foo -R -n . |search from current directory and below, inside of files for "foo", and print a list of file paths, line numbers, and lines that match|
|grep -e foo -R -l . |search from current directory and below, inside of files for "foo", and only print a list of files that match|
|grep -i foo -R -l . |same as previous, but case insensitive "foo" (foo, Foo, FOO, etc...)|

===== Complex Examples =====
  * find all todo's and fixme's, ignoring case, from this directory and deeper, ignoring any results with .svn or .log<code>grep -R -n -iE 'todo|fixme' . | grep -v -E '\.svn|\.log'</code>
  * search all files in this directory and lower, finding carriage returns (\r, ^M)<code>
grep -U -R -P '\x0d' *
or list files only (this example uses octal carriage return)
grep -U -R -l -P '\015' *
</code>