[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: scripting help

From: The Wanderer
Subject: Re: scripting help
Date: Tue, 25 Sep 2007 17:28:00 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050922

Reply addresses set by hand to work around broken defaults. (Again.)

suser wrote:

I am trying to create a script to go through /etc/passwd and change
anyone who's home directory is "/mnt/home" to "/mnt/<username on
linux server>". I have been playing around with loops and regular
expressions but have not got anything close to the results i want. I
have roughly 1000 users so changing them all by hand is quite the

so basically im trying to do something like the following:

Original - user:x:1000:100:user:/mnt/home:/bin/bash

what i want - user:x:1000:100:user:/mnt/user:/bin/bash

any suggestions? thanks in advance!

This is not really a bash-related question as far as I can tell.

I would probably do that with sed, e.g.

sed /etc/passwd -e "s/100:\([^:]*\):\/mnt\/home:/\1:\/mnt\/\1:/g"

or equivalently (I think) but more tersely

sed /etc/passwd -e "s/100:\([^:]*\)\(:\/mnt\/\)home/\1\2\1/g"

You could, of course, add the '-i' flag to have sed make the changes to
the file in place - but I would recommend, instead, redirecting the
output into a separate file and confirming that it is correct, then
copying the new file into place.

      The Wanderer sticks his neck out again

Warning: Simply because I argue an issue does not mean I agree with any
side of it.

Secrecy is the beginning of tyranny.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]