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Full Discussion: How to check the user input to be valid using shell script?
Top Forums Shell Programming and Scripting How to check the user input to be valid using shell script? Post 302774517 by hyeewang on Saturday 2nd of March 2013 09:28:44 AM
Old 03-02-2013
Quote:
Originally Posted by bakunin
What do you mean by "compile error"? What i wrote was Korn-Shell code. Which programming language are you using? (If not a shell, you are probably in the wrong forum. Say so and i transfer the thread to where it belongs.)

I hope this helps.

bakunin
Hi bakunin,

I am a beginner and only use bash shell. I got your idea and changed it to bash shell. It works. Thank you very much.
 

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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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