Finding valid users


 
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# 1  
Old 02-10-2002
Question Finding valid users

Is there a way to determine the names of valid system users? I know that last, finger, and who will give you the names of users who have accessed the system and / or those who are currently logged onto the system. I was trying to determine a way to find the names of any valid user whether or not they have logged onto the system currently or within the last week (finger, last)
# 2  
Old 02-10-2002
The formal list of users is in /etc/passwd, active or not.
Jimbo
# 3  
Old 02-11-2002
Hello

Try command 'logins'

Sharad
# 4  
Old 02-11-2002
finding valid users

Thanks for the replies:
/etc/passwd does contain all the registered users but it is very difficult to pull out their names. Any thoughts???

I also tried logins ---- this doesn't work on my system
# 5  
Old 02-11-2002
How about:
sed 's/:.*//' /etc/passwd
# 6  
Old 02-12-2002
If you're using shadowed passwords, or (like in some BSD systems) master.passwd, you will need access to the version with the encrypted passwords in it. On a Linux system, using shadow passwords, do this as root:
awk -F: '{if($2 != "*") print $1}' /etc/shadow

Those are the users with some (or no) password set. This does not, however, check for users that have had their password expire...
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