grep(1): Add more EXAMPLES
* Add more EXAMPLES covering flags: -A, -B, -c, -f, -i, -H, -l, -q, -R, -w * While here, change existing wording to use the imperative (remove "To find") * Reword first example to be consistent with how grep(1) understand words (-w) Approved by: manpages (bcr@) Differential Revision: https://reviews.freebsd.org/D27264
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2020-12-20 02:59:44 +00:00
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@ -30,7 +30,7 @@
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.\"
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.\" @(#)grep.1 8.3 (Berkeley) 4/18/94
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.\"
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.Dd August 7, 2020
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.Dd November 19, 2020
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.Dt GREP 1
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.Os
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.Sh NAME
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@ -456,13 +456,27 @@ An error occurred.
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.Sh EXAMPLES
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.Bl -dash
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.It
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To find all occurrences of the word
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Find all occurrences of the pattern
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.Sq patricia
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in a file:
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.Pp
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.Dl $ grep 'patricia' myfile
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.It
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To find all occurrences of the pattern
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Same as above but looking only for complete words:
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.Pp
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.Dl $ grep -w 'patricia' myfile
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.It
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Count occurrences of the exact pattern
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.Sq FOO
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:
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.Pp
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.Dl $ grep -c FOO myfile
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.It
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Same as above but ignoring case:
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.Pp
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.Dl $ grep -c -i FOO myfile
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.It
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Find all occurrences of the pattern
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.Ql .Pp
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at the beginning of a line:
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.Pp
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@ -480,20 +494,55 @@ escapes the
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.Ql \&. ,
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which would otherwise match any character.
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.It
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To find all lines in a file which do not contain the words
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Find all lines in a file which do not contain the words
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.Sq foo
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or
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.Sq bar :
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.Pp
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.Dl $ grep -v -e 'foo' -e 'bar' myfile
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.It
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A simple example of an extended regular expression:
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Peruse the file
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.Sq calendar
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looking for either 19, 20, or 25 using extended regular expressions:
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.Pp
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.Dl $ egrep '19|20|25' calendar
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.It
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Show matching lines and the name of the
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.Sq *.h
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files which contain the pattern
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.Sq FIXME .
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Do the search recursively from the
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.Pa /usr/src/sys/arm
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directory
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.Pp
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Peruses the file
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.Sq calendar
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looking for either 19, 20, or 25.
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.Dl $ grep -H -R FIXME --include=*.h /usr/src/sys/arm/
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.It
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Same as above but show only the name of the matching file:
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.Pp
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.Dl $ grep -l -R FIXME --include=*.h /usr/src/sys/arm/
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.It
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Show lines containing the text
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.Sq foo .
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The matching part of the output is colored and every line is prefixed with
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the line number and the offset in the file for those lines that matched.
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.Pp
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.Dl $ grep -b --colour -n foo myfile
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.It
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Show lines that match the extended regular expression patterns read from the
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standard input:
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.Pp
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.Dl $ echo -e 'Free\enBSD\enAll.*reserved' | grep -E -f - myfile
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.It
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Show lines from the output of the
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.Xr pciconf 8
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command matching the specified extended regular expression along with
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three lines of leading context and one line of trailing context:
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.Pp
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.Dl $ pciconf -lv | grep -B3 -A1 -E 'class.*=.*storage'
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.It
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Suppress any output and use the exit status to show an appropriate message:
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.Pp
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.Dl $ grep -q foo myfile && echo File matches
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.El
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.Sh SEE ALSO
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.Xr ed 1 ,
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