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test to see if useradd worked

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# 1  
Old 08-26-2005
Error test to see if useradd worked
I am trying to write a script that does a useradd -G <group> <user> but you cannot modify the user if he/she is logged on. How could I check to see if the user is on or if the user has been added to the group successfully? I plan on having the script sleep for a couple mins if the user is on then attempt to add the user to the group again.
Last edited by doublejz; 08-26-2005 at 11:03 AM..
# 2  
Old 08-26-2005
useradd sets the exit status. So just check the exit status as you would for any other well designed program.
# 3  
Old 08-26-2005
Quote:
Originally Posted by Perderabo
useradd sets the exit status. So just check the exit status as you would for any other well designed program.
To elaborate on that, bash (if that's what you're using) will let you use an IF statement to check exit status in a very readable way:

Code:
if useradd <args>; then
  do stuff
else
  do other stuff
fi

# 4  
Old 08-27-2005
Hi !
In addition to what vertigo23 and perderabo said, you can check the $? variable. This will tell you the error code returned by the last command (in your case, useradd). If the result is 0, then the last command exited without any error. If it tells you something else, check the manual pages or google to see what it means.
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