grep
Globally find R.E. patterns and print (display) that line
Usage: grep R.E.pattern [list-of-files]
Standard Input: Used only if no list-of-files is given
Standard Output: Used to display results
See wildcards for regular expressions.
SEE ALSO
 | For more information, see page 494 |
Useful options:
-c means to display just filenames and count of lines that contain the pattern.
-i means to ignore upper/lowercase.
-l means just list the filenames that contain the pattern.
-n means to include the line number with each line displayed.
-v means to reverse the test; show lines that do not contain the pattern.
-y same as -i, but only on older UNIX systems.
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