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Change /etc/passwd shell to telnet with parameters

 
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Old 11-04-2009
Question Change /etc/passwd shell to telnet with parameters
Hello *nix users,

I'm wondering if there's a way to change a user's default shell in /etc/passwd to the telnet program along with some parameters.

For instance:
user:x:1001:1001::/home/user:/usr/bin/telnet localhost 12345

The above line in the /etc/passwd file gives the following error message:
Cannot execute /usr/bin/telnet localhost 12345: No such file or directory

Simply removing the telnet parameters fixes the error message, but I want anyone signing in as the user to A) not have a shell and B) be automatically telnet'd to localhost on port 12345.

It seemed like setting the user's shell to /usr/bin/telnet localhost 12345 should have worked, but perhaps I am missing something. This seems like an ideal solution, so fixing it is preferable, but alternate solutions are welcome as well!

Any help or suggestions are appreciated!

Thanks.
 
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LEARN ABOUT V7

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.

       -R, --root CHROOT_DIR
	   Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

       -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).

shadow-utils 4.5						    01/25/2018								   CHSH(1)