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grep, g - search a file for a pattern


grep [ option ... ] pattern [ file ... ]

g [ option ... ] pattern [ file ... ]


Grep searches the input files (standard input default) for lines that match the pattern, a
regular expression as defined in regexp(7) with the addition of a newline character as an
alternative (substitute for |) with lowest precedence. Normally, each line matching the
pattern is `selected', and each selected line is copied to the standard output. The
options are

-c Print only a count of matching lines.
-h Do not print file name tags (headers) with output lines.
-e The following argument is taken as a pattern. This option makes it easy to specify
patterns that might confuse argument parsing, such as -n.
-i Ignore alphabetic case distinctions. The implementation folds into lower case all
letters in the pattern and input before interpretation. Matched lines are printed
in their original form.
-l (ell) Print the names of files with selected lines; don't print the lines.
-L Print the names of files with no selected lines; the converse of -l.
-n Mark each printed line with its line number counted in its file.
-s Produce no output, but return status.
-v Reverse: print lines that do not match the pattern.
-f The pattern argument is the name of a file containing regular expressions one per
-b Don't buffer the output: write each output line as soon as it is discovered.

Output lines are tagged by file name when there is more than one input file. (To force
this tagging, include /dev/null as a file name argument.)

Care should be taken when using the shell metacharacters $*[^|()=\ and newline in pattern;
it is safest to enclose the entire expression in single quotes '...'. An expression
starting with '*' will treat the rest of the expression as literal characters.

G invokes grep with -n and forces tagging of output lines by file name. If no files are
listed, it searches all files matching

*.C *.b *.c *.h *.m *.cc *.java *.cgi *.pl *.py *.tex *.ms



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