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Full Discussion: Users Not Logged in
Top Forums Shell Programming and Scripting Users Not Logged in Post 302302013 by cfajohnson on Sunday 29th of March 2009 07:15:53 PM
Old 03-29-2009
Quote:
Originally Posted by methyl
Please state your Operating System and version and preferred Shell in questions.

It can be done with standard commands.
Quote:
There is no generic unix command to show who has an account but is not logged in. There are enhanced versions of "finger" on some unixes but this is non-standard.

We can subtract "who -u" from "logins". We could equally use "listusers" instead of "logins" or even read /etc/passwd directly.
For example:

Code:
#!/bin/ksh
# Who is logged in now?
who -u | awk '{print $1}' >/tmp/who_u.$$
# Who has an account?
logins | awk '{print $1}' > /tmp/logins.$$$


Code:
$ logins
-bash: logins: command not found

Quote:
Code:
# Users who appear in "logins" but not in "who -u"
cat /tmp/logins.$$ /tmp/who_u.$$ | sort | uniq -u | pg


UUOC.

Sort will be slow on a large system, and it's not needed.

bash: pg: command not found

Quote:
Code:
# Clean up temporary files
rm /tmp/logins.$$
rm /tmp/who_u.$$


You don't need two calls to rm:

Code:
rm /tmp/logins.$$ /tmp/who_u.$$

 

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LEARN ABOUT DEBIAN

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 4.1.5.1						    05/25/2012								   CHSH(1)
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