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Full Discussion: Why passwd isnt working in shell scripts?
Top Forums Shell Programming and Scripting Why passwd isnt working in shell scripts? Post 34039 by Perderabo on Friday 31st of January 2003 09:46:36 AM
Old 01-31-2003
passwd opens /dev/tty for reading. And it will read /dev/tty to obtain a password. Before it reads the terminal, it reconfigures it to turn off echo, so that the password cannot be seen as it is typed. If that reconfiguration fails, passwd will give up. And after it has the password, it turns echo back on. Operations like these simply require a terminal.

If that behavior is acceptable, then the passwd command does indeed work in scripts just fine. The "problem" is that people want the script to be able to supply the password rather than the user of the script. In that case, you need expect.
 

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LEARN ABOUT LINUX

chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

       chsh - change login shell

SYNOPSIS

       chsh [options] [LOGIN]

DESCRIPTION

       The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change
       the login shell for her own account; the superuser may change the login shell for any account.

OPTIONS

       The options which apply to the chsh command are:

       -h, --help
	   Display help message and exit.

       -s, --shell SHELL
	   The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.

       If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new
       value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks.

NOTE

       The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser,
       and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh
       in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell
       back to its original value.

FILES

       /etc/passwd
	   User account information.

       /etc/shells
	   List of valid login shells.

       /etc/login.defs
	   Shadow password suite configuration.

SEE ALSO

       chfn(1), login.defs(5), passwd(5).

User Commands							    06/24/2011								   CHSH(1)
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