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pattern match and replace another pattern in same line

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# 1  
Old 11-18-2011
pattern match and replace another pattern in same line
I have a pattern
Code:
username:x:32005:32006::/usr/local/user:/bin/bash

I need to match the line containing username and replace /bin/bash with /usr/local/my/bin/noshell

So it becomes
Code:
username:x:32005:32006::/usr/local/user:/usr/local/my/bin/noshell

# 2  
Old 11-18-2011
This will print all lines, but first modify the shell field if the username matches username.

Code:
awk -v FS=: -v OFS=: -v USER="username" '$1==USER { $7="/usr/local/my/bin/noshell" } 1' < input > output

# CHECK THE OUTPUT FIRST before overwriting your input!
# You don't want to mangle /etc/passwd by accident.
# Also, overwrite it, don't do mv output input.  
# Changing /etc/passwd's ownership or permissions would be bad.
cat output > input

# 3  
Old 11-18-2011
It comes as follows.
Code:
user:x:32008:32011::/home/user:/bin/bash:/usr/local/my/bin/noshell

# 4  
Old 11-18-2011
Did you outrun my edit? I briefly posted it with $8 when it was supposed to be $7, which would do exactly that.

I also modified it so you can pass in the username more easily.
This User Gave Thanks to Corona688 For This Post:
anilcliff
# 5  
Old 11-18-2011
This worked

Code:
# grep username /etc/passwd | sed 's/\/bin\/bash/\/sbin\/nologin/'
username:x:32008:32011::/home/user:/sbin/nologin

---------- Post updated 11-19-11 at 12:01 AM ---------- Previous update was 11-18-11 at 11:59 PM ----------

Corona688

Just checked your modified stuff. It works well. Thanks Smilie
# 6  
Old 11-18-2011
Using sed alone...
Code:
sed -i '/^username/{s!/bin/bash!/sbin/nologin!g}' /etc/passwd

This will modify the file /etc/passwd... so be careful... You can test it out first by removing -i option...

--ahamed
Last edited by ahamed101; 11-18-2011 at 02:51 PM.. Reason: code change!
# 7  
Old 11-18-2011
Quote:
Originally Posted by anilcliff
This worked

Code:
# grep username /etc/passwd | sed 's/\/bin\/bash/\/sbin\/nologin/'
username:x:32008:32011::/home/user:/sbin/nologin

Not trustworthy. What if they just happen to have username in their comment field, home directory, or path?
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