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Old 05-08-2006, 06:36 AM   #1
Registered: Aug 2005
Location: India
Posts: 33

Rep: Reputation: 15
Need help to write Shell Script

Hi ,

Can Any one tell me how I will be able to overwrite specific line from a file using Shell script.

For Example
Suppose from /etc/passwd file if I have to find entry of any user say user "a" and modify it with some other value....But only the entry of user "a"....How should I do this,

Please help Me.

Old 05-08-2006, 07:10 AM   #2
Registered: Jan 2005
Location: Finland
Distribution: Ubuntu, Debian, Gentoo, Slackware
Posts: 827

Rep: Reputation: 31
The easiest way to do it would be to use sed.
A sample:
cat /etc/passwd | sed 's/username.*/foouser:x:1111:111::\/home\/foouser:\/bin\/bash/'
Remember to escape the path slashes.. (:


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