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Forum index » Off-Topic Area » Programming

grep an exact number

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trio

Joined: 21 Dec 2008
Posts: 1788
Location: अनुमोदना

Posted: Tue 09 Feb 2010, 08:52 Post_subject:

grep an exact number

Dear all,

Please help this dummy, I want to grep an exact number, how to do that? And yes, I am stupid.

Example:
in a file you have lines numbered from 1 to 100, you want to grep exactly line number 9, but I do:

Code:

grep 9 /path/to/file.txt

I will get lines numbered 9, 19, 29, etc But I want only line number 9

Thanks
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dejan555

Joined: 30 Nov 2008
Posts: 2537
Location: Montenegro

Posted: Tue 09 Feb 2010, 09:18 Post_subject:

you can use sed:

Code:

sed -n '9p' /path/to/file.txt

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seaside

Joined: 11 Apr 2007
Posts: 875

Posted: Tue 09 Feb 2010, 12:21 Post_subject:

Trio,

Also,

Code:

grep -w 9 /path/to/file.txt

The "-w" matches a single word only

s

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Shel

Joined: 11 Apr 2009
Posts: 103
Location: Seattle, WA, USA, or Southern France

Posted: Wed 10 Feb 2010, 05:10 Post_subject:

If the number "9" is at the beginning of a line, you can check for that:

Code:

grep '^9' filename

... of if it's followed with a space, you can check for that:

Code:

grep '9 ' filename

or combine the two, etc. grep will do fairly complex regular expressions, so you can look for a "9" at the beginning of a line, followed by, say, a capital letter:

Code:

grep '^9[A-Z]' filename

I think those are all correct, I'm not in a position to check them at the moment, but doco for grep is all over the 'net.

-Shel

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trio

Joined: 21 Dec 2008
Posts: 1788
Location: अनुमोदना

Posted: Wed 10 Feb 2010, 05:26 Post_subject:

Thx all...seaside's answer did the job
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