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How to grep "--"

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Top Forums Shell Programming and Scripting How to grep "--"
# 1  
Old 07-18-2012
How to grep "--"
Just looking for
Code:
cat file | grep "--"

# 2  
Old 07-18-2012
I'm not clear on the question. Are you looking to match records containing a double hyphen?

Try:-
Code:
grep "\-\-" file

The problem could be just that the hyphen is a special character, so you need to use the backslash to define you string to use it as just some text.


I hope that this helps

Robin
Liverpool/Blackburn
UK
This User Gave Thanks to rbatte1 For This Post:
Tribe
# 3  
Old 07-18-2012
Quote:
Originally Posted by rbatte1
I'm not clear on the question. Are you looking to match records containing a double hyphen?

Try:-
Code:
grep "\-\-" file

The problem could be just that the hyphen is a special character, so you need to use the backslash to define you string to use it as just some text.


I hope that this helps

Robin
Liverpool/Blackburn
UK
It worked. I tried without the quotes but obviously didn't apply. To show lines containing two hyphens and not more I use:
Code:
cat file | grep "\-\-" | grep -v "\-\-\-"

Last edited by Tribe; 07-18-2012 at 01:31 PM..
# 4  
Old 07-18-2012
Excellent. Pleased to be of assistance.



Robin
# 5  
Old 07-18-2012
See also Useless Use of Cat.

Code:
grep "\-\-" file | grep -v "\-\-\-"

Or you can do it all in one awk:

Code:
awk '/--/ && !/---/' file

This User Gave Thanks to Corona688 For This Post:
Tribe
# 6  
Old 07-18-2012
Quote:
Originally Posted by Corona688
See also Useless Use of Cat.

Code:
grep "\-\-" file | grep -v "\-\-\-"

Or you can do it all in one awk:

Code:
awk '/--/ && !/---/' file

Loved that one
Code:
 <file awk '/--/ && !/---/'

# 7  
Old 07-19-2012
Quote:
Originally Posted by Tribe
Just looking for
Code:
cat file | grep "--"


-- itself is the solution. If you ever need to grep these kind of words/strings etc, use "--" to disable to treat them as a switch

Code:
$ cat f3
--
-i
-v
$ 


$ grep -- -i f3
-i
$ grep -- -v f3
-v
$ grep -- -- f3
--


This also applies to other commands.

e.g.
Code:
$ touch -t
touch: option requires an argument -- t
Try `touch --help' for more information.
$ 
$
$ touch -- -t
$
$ rm -t
rm: unknown option -- t
Try `rm ./-t' to remove the file `-t'.
Try `rm --help' for more information.
$
$
$ rm -- -t
$


Hope it helps.
These 2 Users Gave Thanks to clx For This Post:
Tribe zedex
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