Solved

piping input to passwd

Posted on 1998-09-17
2
1,055 Views
Last Modified: 2012-08-14
I'm using Redhat 5.1.
I want to set a user's password from a shell script without and human intervention.

I have tried this (and various others):

echo -e "foo123\nfoo123" | passwd foobar

But I get this:
New UNIX password: Retype new UNIX password:
New UNIX password:
New UNIX password:
passwd: Conversation error

Any ideas?

Many Thanks!

0
Comment
Question by:mag062397
2 Comments
 
LVL 3

Accepted Solution

by:
marcelofr earned 50 total points
ID: 1638062
passwd command reads from the tty DIRECTLY, not from stdin so you need at least a pseudo tty. The following expect script may help you:

#!/usr/bin/expect
set oldpass [lindex $argv 0]
set newpass [lindex $argv 1]
spawn /usr/bin/passwd
expect word:
sleep 1
send $oldpass\r
expect word:
sleep 1
send $newpass\r
expect word:
sleep 1
send $newpass\r

Put this stuff in a script, chmod +x it and call it passing old and new passwords as parameters.

Good Luck
0
 

Author Comment

by:mag062397
ID: 1638063
Thank you I got it working.  The only thing I had to add was either a "sleep 1" or an "expect success" at the end of the script.  For some reason the script would end and I think the passwd program would think it was killed or something so it would not make the change.  By putting in one more expect string the script waits until passwd completes its task.  A sleep 1 also worked; however I'm going to stick with the expect success.

Thanks again.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Configuring Apache Camel to send and recieive from QPID Broker 2 34
LINUX backups with VEEAM 8 158
Linux MD5 Hash 7 66
NTPD Client Port Usage 12 65
This is the error message I got (CODE) Error caused by incompatible libmp3lame 3.98-2 with ffmpeg I've googled this error message and found out sometimes it attaches this note "can be treated with downgrade libmp3lame to version 3.97 or 3.98" …
Introduction We as admins face situation where we need to redirect websites to another. This may be required as a part of an upgrade keeping the old URL but website should be served from new URL. This document would brief you on different ways ca…
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question