Basic Grep Question
Marc Schwartz
marc_schwartz at comcast.net
Tue Mar 13 16:17:46 UTC 2007
Dan Track wrote:
> Hi
>
> Could someone please tell me how I can grep for two or more different
> words in one command instead of piping them through.
>
> e.g I don't want to do
>
> cat /tmp/file | grep -v cat | grep -v grey
>
> I'd like to run that from one grep command.
>
> Many Thanks
> Dan
Two possibilities:
$ cat .Xresources
Emacs.default.attributeBackground: white
Emacs.default.attributeForeground: black
!
XEmacs*EmacsFrame.default.attributeForeground: black
XEmacs*EmacsFrame.default.attributeBackground: white
!
xterm*geometry: 100x32
xterm*faceName: bitstream vera sans mono
xterm*faceSize: 12
xterm*background: white
xterm*rightScrollBar: true
# Use grep with the -E arg to specify extended
# regex usage
$ cat .Xresources | grep -Ev "(white|black)"
!
!
xterm*geometry: 100x32
xterm*faceName: bitstream vera sans mono
xterm*faceSize: 12
xterm*rightScrollBar: true
# Or just use egrep
$ cat .Xresources | egrep -v "(white|black)"
!
!
xterm*geometry: 100x32
xterm*faceName: bitstream vera sans mono
xterm*faceSize: 12
xterm*rightScrollBar: true
You might want to look at:
http://en.wikipedia.org/wiki/Regular_expression
http://www.regular-expressions.info/
There is also a great book:
http://regex.info/
HTH,
Marc Schwartz
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