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Automatically setting user passwords

Posted on 2004-08-23
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Last Modified: 2013-12-27
I often need to set up a bunch of users with fixed passwords. I've got a script to create the users and everything but cannot set the passwords using this method - piping the password into the input for that script gives "permission denied". Q1 - Is there a way around this?

If we can't get past that, I've got a script to append the encrypted form of the correct passsword in /etc/shadow. However I don't know how to first remove the line that has the current user password, thus the user appears to have 2 passwords and everything screws up. So Q2 How can you search a file for a certain string and delete that line? (In the script below, I'd want to search /etc/shadow for the line with username1 in, delete that line, then run my script below)

FYI Here's the script I'm using to append the correct passwords:

echo username1:`perl -e '$x=crypt('userpwd1','CrypKey');
print $x'`::::::: >> /etc/shadow
etc...
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Question by:Shtukka
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tfewster earned 750 total points
ID: 11869311
Q1: You could with an Expect script, but not with "standard" tools.


Q2:
grep -v "^username1:" /etc/shadow > /etc/shadow.tmp
(Note the ^ and the : in the grap pattern to ensure we get ONLY the line we want)

Then run your perl script on /etc/shadow.tmp

Alternatively:
awk -F: '{if ( USER == $1 ) {OFS=":"; print $1,PW,$3,$4,$5,$6,$7,$8,$9}}'  USER=username1 PW=$x  /etc/shadow > /etc/shadow.new
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