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Full Discussion: Use of stty vs trap in script-driven login menu
Top Forums Shell Programming and Scripting Use of stty vs trap in script-driven login menu Post 302607507 by Corona688 on Wednesday 14th of March 2012 03:37:35 PM
Old 03-14-2012
I'd consider trap safer because it can eat a SIGINT from any source -- kill and the like -- not just those that come from the keyboard. Besides, who's to say you don't want the program to do something on ctrl-c?

The main advantage of changing their login shell to your script is that, if they manage to kill it somehow, all they accomplish is logging themselves out. There's no interactive shell behind your application to "break out" into. Disadvantage is that it can be harder to arrange. Some systems need you to add your application to /etc/shells before they'll let people use it as their 'shell'.

I'm sure there's general-purpose menu systems. Of course, just because something's compiled doesn't mean it doesn't have holes -- it just makes it harder to know whether it has holes...
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LEARN ABOUT X11R4

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)
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