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Change Password In A Shell Script

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Change Password In A Shell Script

Apr 12th, 2006

Hi All,

I have a problem.

I need to write a shell script to change the password. The user may want to change his own password by this script.

He will have to provide the required 3 parameters i.e. old password, new password and retype new password as arguments in command line.

like, ./pass.sh old new new

How do I do it. I am in a fix.

I am not allowed to use expect etc.

Please help me.

Thanks.
Asimananda

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Join Date: Jan 2004

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Re: Change Password In A Shell Script

Apr 19th, 2006

You shouldn't have to do it. Linux has this built in with

passwd

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Re: Change Password In A Shell Script

May 9th, 2006

i am using a shell script which changes the password of all the servers in the network and also of the host server (as per your requirement) but it uses except.

Earlier i had a perl script to change the password.

If you want i can give you both the scripts and you can modify them as per your requirement.

Amit

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Re: Change Password In A Shell Script

May 12th, 2006

Sounds like a class asignment.
try a here document

 Help with Code Tags 
 Shell Scripting Syntax (Toggle Plain Text) 
oldpw="$1"
newpw="$2"
passwd <<EOF
"$1"
"$2"
"$2"
EOF
oldpw="$1"
newpw="$2"
passwd <<EOF
"$1"
"$2"
"$2"
EOF

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Re: Change Password In A Shell Script

May 31st, 2006

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Originally Posted by kamitsin

i am using a shell script which changes the password of all the servers in the network and also of the host server (as per your requirement) but it uses except.

Earlier i had a perl script to change the password.

If you want i can give you both the scripts and you can modify them as per your requirement.

Amit

Amit,

I would be very interested in your scripts. Would you mind sending them to me at . This sounds exactly what I am needing.
Thanks

PS

Last edited by 'Stein; Aug 14th, 2006 at 2:32 am.

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Re: Change Password In A Shell Script

Jun 1st, 2006

I have attached the modified script beacuse the original script is for changing the password across multiple servers and i guess this is not what you require.

You need to execute the script from root user. It will create a log file in the directory from which you are executing the script.

You can change the password for root and a user but you can do a small modification and the script will change the password for root and any user.

Amit

Attached Files

ChangePassword.exp.txt (2.7 KB, 669 views)

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Re: Change Password In A Shell Script

Jun 21st, 2006

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Originally Posted by kamitsin

I have attached the modified script beacuse the original script is for changing the password across multiple servers and i guess this is not what you require.

You need to execute the script from root user. It will create a log file in the directory from which you are executing the script.

You can change the password for root and a user but you can do a small modification and the script will change the password for root and any user.

Amit

Hi Amit,

Do you have a similar script (only ChangePasswd) in Perl? If you do can you please share it.

Thanks,
Vivek.

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Re: Change Password In A Shell Script

Jul 7th, 2006

Hi Amit,

I am looking for a script just like yours: I have many servers and I need to change their root psw.
Could you post the entire script?
thanks a lot

Ezra

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Originally Posted by kamitsin

I have attached the modified script beacuse the original script is for changing the password across multiple servers and i guess this is not what you require.

You need to execute the script from root user. It will create a log file in the directory from which you are executing the script.

You can change the password for root and a user but you can do a small modification and the script will change the password for root and any user.

Amit

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Re: Change Password In A Shell Script

Aug 14th, 2006

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Originally Posted by kamitsin

I have attached the modified script beacuse the original script is for changing the password across multiple servers and i guess this is not what you require.

You need to execute the script from root user. It will create a log file in the directory from which you are executing the script.

You can change the password for root and a user but you can do a small modification and the script will change the password for root and any user.

Amit

Hi Amit,

Im looking for the script which you have for changing password on multiple servers. Would you mind sending them to me at.

Thanks and regards,
VinodKumar

Last edited by 'Stein; Aug 14th, 2006 at 2:33 am.

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Re: Change Password In A Shell Script

#10

Sep 6th, 2006

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Originally Posted by kamitsin

I have attached the modified script beacuse the original script is for changing the password across multiple servers and i guess this is not what you require.

You need to execute the script from root user. It will create a log file in the directory from which you are executing the script.

You can change the password for root and a user but you can do a small modification and the script will change the password for root and any user.

Amit

Hello Amit,

I am trying to get a perl script to communicate with the passwd program. I do not have access to the modules expect or IO:

ty. I also do not have access to the expect utility.

So far I have found a free pty/tty pair and opened them and set them to autoflush. Then I fork.

In the child I close stdin, stdout and stderr to reopen them associated to the new tty handle and exec passwd.

In the parent I want to read and write to the pty to interact with passwd. This is not working. The passwd direct access to the tty is not reaching my tty.

Maybe I need to set the controling tty in the child before doing the exec? How do I do that?

Cheers,
sut