Index: usr.bin/grep/grep.1 =================================================================== --- usr.bin/grep/grep.1 +++ usr.bin/grep/grep.1 @@ -456,13 +456,24 @@ .Sh EXAMPLES .Bl -dash .It -To find all occurrences of the word +Find all occurrences of the text .Sq patricia in a file: .Pp .Dl $ grep 'patricia' myfile .It -To find all occurrences of the pattern +Same as above but looking only for complete words: +.Pp +.Dl $ grep -w 'patricia' myfile +.It +Count occurrences of the text +.Sq foo +: +.Bd -literal -offset indent +$ grep -c foo myfile +.Ed +.It +Find all occurrences of the pattern .Ql .Pp at the beginning of a line: .Pp @@ -480,20 +491,56 @@ .Ql \&. , which would otherwise match any character. .It -To find all lines in a file which do not contain the words +Find all lines in a file which do not contain the words .Sq foo or .Sq bar : .Pp .Dl $ grep -v -e 'foo' -e 'bar' myfile .It -A simple example of an extended regular expression: +Peruse the file +.Sq calendar +looking for either 19, 20, or 25 using extended regular expressions: .Pp .Dl $ egrep '19|20|25' calendar +.It +Show matching lines and the name of the +.Sq *.h +files which contain the text +.Sq FIXME +ignoring case. +Do the search recursively from the +.Pa /usr/src/sys/arm +directory .Pp -Peruses the file -.Sq calendar -looking for either 19, 20, or 25. +.Dl $ grep -H -i -R FIXME --include=*.h /usr/src/sys/arm/ +.It +Same as above but showing only the name of the matching file: +.Pp +.Dl $ grep -l -i -R FIXME --include=*.h /usr/src/sys/arm/ +.It +Show lines containing the text +.Sq foo . +The matching part of the output is colored and every line is prefixed with +the line number and the offset in the file for those lines that matched. +.Pp +.Dl $ grep -b --colour -n foo myfile +.It +Show lines that match the extended regular expression patterns read from the +standard input: +.Pp +.Dl $ echo -e 'Free\enBSD\enAll.*reserved' | grep -E -f - myfile +.It +Show lines from the output of the +.Xr pciconf 8 +command matching the specified extended regular expression along with +three lines of leading context and one line of trailing context: +.Pp +.Dl $ pciconf -lv | grep -B3 -A1 -E 'class.*=.*storage' +.It +Suppress any output and use the exit status to show an appropriate message: +.Pp +.Dl $ grep -q foo myfile && echo File matches .El .Sh SEE ALSO .Xr ed 1 ,