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Shell Programming and Scripting

script to modify /etc/shadow

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# 1  
Old 09-15-2008
script to modify /etc/shadow
Hi

I am looking for script to modify /etc/shadow.

For example:
1-)User enters username
2-)The line of that user is found in /etc/shadow and *LK* is added infront of the second field in /etc/shadow.

How can I do this?

Thanks
# 2  
Old 09-15-2008
Code:
nawk -v user="$user" 'BEGIN{FS=":"}
{
if($1==user)
{
  $2=*LK*
  print
}' /etc/shadow

# 3  
Old 09-15-2008
And here is the sed solution:
Code:
sed -i "/$user/s/\([^:]*:\)\{1\}/&*LK/" /etc/shadow

You can build the script from here.
# 4  
Old 09-16-2008
the nawk solutions need to be slightly modified. the requirements asked for a *LK* to be prepended to the second field - not replace the entire field.

the sed solution should use ^$user: for the pattern to ensure that only one account gets modified.
# 5  
Old 09-16-2008
thanks a lot, I will work on them
# 6  
Old 09-16-2008
one last thing;
after user enters username
I want to check the username with the usernames in the /etc/shadow.
If the entered username doesnt exist, I will return error,
else I will lock the account with
sed -i "/$user/s/\([^:]*:\)\{1\}/&*LK/" /etc/shadow

How can I do that?
# 7  
Old 09-16-2008
This should work.
Code:
test $(grep -c $user /etc/shadow) -gt 0 && sed -i "/$user/s/\([^:]*:\)\{1\}/&*LK/" /etc/shadow || echo ERROR
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