topic Re: Script help in Operating System - Linux

Script help

Senthil Prabu.S_1 — Tue, 06 Dec 2005 07:03:45 GMT

Hi all,
I want to write a shell script to automate the useradd and assigning password to that user [ only through shell script ]. I tried with using "EOF" but still the script prompts for passowrd.

The script that I wrote was
!/usr/bin/sh -x
useradd prasad
echo "vnc" 2>&1
# Here prasad is username and test is password.
passwd prasad << EOF
test
test
EOF

Can anyone help me to automate this......

Thanks,
Prabu.S

Re: Script help

Senthil Prabu.S_1 — Tue, 06 Dec 2005 07:07:12 GMT

And also I dont want to do this using expect.

Re: Script help

Alexander Chuzhoy — Tue, 06 Dec 2005 08:07:13 GMT

here's an example
#!/bin/bash
for i in `seq 1 10`
do useradd user$i
echo password$i |passwd --stdin user$i
done
exit
it adds 10 users user1, user2,etc
and gives each the password same as username.

Re: Script help

Senthil Prabu.S_1 — Tue, 06 Dec 2005 08:41:45 GMT

No, the script fails

The error is
Try `passwd --help' or `passwd --usage' for more information.
passwd: unrecognized option `--stdin'

Re: Script help

Alexander Chuzhoy — Tue, 06 Dec 2005 08:50:04 GMT

what operating system do you use?

Re: Script help

Senthil Prabu.S_1 — Tue, 06 Dec 2005 08:54:05 GMT

Hi,

cat /etc/SuSE-release
SUSE LINUX Enterprise Server 9 (i586)
VERSION = 9
PATCHLEVEL = 2

Any inputs......

Re: Script help

Senthil Prabu.S_1 — Tue, 06 Dec 2005 09:42:02 GMT

Hi alex,
I googled but no use.
My passwd utility doesnot support --stdin option.

Is this possible to do in a shell script?

Re: Script help

Alexander Chuzhoy — Tue, 06 Dec 2005 10:52:31 GMT

You can use the -p key for useradd command
try:
useradd test -p password for example.
Where password is the crypted password.

Re: Script help

Senthil Prabu.S_1 — Tue, 06 Dec 2005 23:53:28 GMT

Hi Alex,
My problem is that I wanted to create a user account and also assign password to that user, to be done in a shell script. Any another script uses this user to do some operations.

So, useradd -p will never going to help me.

Re: Script help

Muthukumar_5 — Wed, 07 Dec 2005 01:31:41 GMT

;) hi how r u.

You can not achive this with back scripting with EOF format as like ftp.

Few ways to accomplish as,

1) expect scripting to accomplish job
2) telnet piping script as,

(
sleep 1
echo "root"
sleep 1
echo ""
sleep 1
echo "passwd "
sleep 1
echo "password"
sleep 1
echo "password"
sleep 1
echo "exit"
) | telnet localhost

Change the sleep timings based on your system speed. Revert back if this is not working.

-Muthu

Re: Script help

Senthil Prabu.S_1 — Wed, 07 Dec 2005 03:57:46 GMT

Hi,
:-), nice to hear from you.I modified ur script as below;
#!/bin/bash
useradd test
(
sleep 1
echo "test"
sleep 1
echo "test"
sleep 1
echo "passwd test"
sleep 1
echo "test"
sleep 1
echo "test"
sleep 1
echo "exit"
) | telnet localhost

When I execute it,
kassel1:/home/rtp40/prabu # ./2.sh
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused

entry in /etc/passwd
test:x:5002:100::/home/test:/bin/bash

entry in /etc/shadow
test:x:5002:100::/home/test:/bin/bash

Can you throw some more lights on this......

Re: Script help

Muthukumar_5 — Wed, 07 Dec 2005 04:21:25 GMT

change localhost to your machine name or machine ip-address itself. Just try to connect with the machine where you want to change password of the user account with telnet. It may be localhost or 127.0.0.1 or hostname or ip-address or FQDN.

-Muthu

Re: Script help

Senthil Prabu.S_1 — Wed, 07 Dec 2005 04:36:54 GMT

I tried on another machine.

Output:
bash-3.00# ./2.sh
+ useradd test
+ sleep 1
+ telnet localhost
Trying ::1...
Connected to localhost.
Escape character is '^]'.
+ echo test
+ sleep 1
+ echo test
+ sleep 1
login: Password: + echo 'passwd test'
+ sleep 1

+ echo test1
test1
+ sleep 1
+ echo test1
test1
+ sleep 1
+ echo exit
exit
Connection to localhost closed by foreign host.
bash-3.00#

But I couldnot login as test using passeord,
"test1". It fails.

Re: Script help

Muthukumar_5 — Wed, 07 Dec 2005 04:40:48 GMT

It is the problem sleep statements. You have to vary the sleep timings based on your machine. I hope your machine is *dead* slow to get login prompt. Change first sleep before echo "account name" as sleep 3 and try. Vary sleep timings upto the passwd command is getting worked.

-Muthu

Re: Script help

Jess Long — Wed, 07 Dec 2005 09:36:42 GMT

The following modification of the above script will add 10 users, user1, user2, etc. and set the password for each the same as the username.

#!/bin/bash
for i in `seq 1 10`
do
useradd -m -p user${i} user${i}
done
exit

The -p option sets the encrypted password.

JL

Re: Script help

Alan_152 — Wed, 07 Dec 2005 12:37:00 GMT

The CD that comes with Nemeth et al's Unix System Administration Handbook has exactly the utility you want. You should be able to download a current image of the CD from the publisher's web site.