.TH GREP 1
.SH NAME
grep \- search a file for a pattern
.SH SYNOPSIS
.B grep
[
.B \-v
] [
.B \-c
] [
.B \-l
] [
.B \-n
] [
.B \-b
] [
.B \-s
] [
.B \-h
] [
.B \-y
] [
.B \-e
] expression [ file ] ...
.SH DESCRIPTION
.I Grep
searches the input files
(standard input default)
for lines matching the
regular expression.
Normally, each line found
is copied to the standard output.
The following options are recognized:
.TP
.B \-v
All lines but those matching
are printed.
.TP
.B \-c
Only a count of matching lines is printed.
.TP
.B \-l
The names of files with matching lines are listed (once)
separated by newlines.
.TP
.B \-n
Each line is preceded by
its line number in the file.
.TP
.B \-b
Each line is preceded by the block number
on which it was found.
This is sometimes useful in locating
disk block numbers by context.
.TP
.B \-s
No output is produced, only status.
.TP
.B \-h
Do not print filename headers with output lines.
.TP
.B \-y
Lower case letters in the pattern will also match
upper case letters in the input file
.RI ( grep
only).
.TP
.BI \-e " expression"
Same as a simple
.I expression 
argument,
but useful when the
.I expression
begins with a '\fB\-\fP'.
.TP
.BI \-f " file"
The regular expression
.RI ( egrep )
or string list
.RI ( fgrep ) 
is taken from the
.I file.
.TP
.B \-x
(Exact) only lines matched in their entirety are printed
.RI ( fgrep
only).
Care should be taken when
using the characters
$ * [ ^ | ( ) and \\ in the regular
expression as they are
also meaningful to the shell.
It is generally necessary to enclose the
entire
.I expression
argument in quotes.
.SH "SEE ALSO"
ex(1)
.SH BUGS
Lines
are limited to 256 characters;
longer lines are truncated.