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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 HPUX

chsh

chsh(1) 						      General Commands Manual							   chsh(1)

NAME

       chsh - change default login shell

SYNOPSIS

       login-name [shell]

       login-name [shell]

       login-name [shell]

       login-name [shell]

DESCRIPTION

       The command changes the login-shell for a user's login name in the repository (see passwd(1)).

       The  DCE  repository is only available if Integrated Login has been configured; see auth.adm(1M).  If Integrated Login has been configured,
       other considerations apply.  A user with appropriate DCE privileges is capable of modifying a user's shell;  this  is  not  dependent  upon
       superuser privileges.

       If the repository is not specified (as in [login-name]), the login shell is changed in the file only.

       Run after running to make sure the information was processed correctly.

   Notes
       The  command  is  a hard link to the command. When is executed, actually the command gets executed with appropriate arguments to change the
       user login shell in the repository specified in command line. If no repository is specified, the login shell is changed in the file.

   Arguments
	      login-name  A login name of a user.

	      shell	  The absolute path name of a shell.  If the file exists, the new login shell must be listed in that file.  Otherwise, you
			  can specify one of the standard shells listed in the getusershell(3C) manual entry.  If shell is omitted, it defaults to
			  the POSIX shell,

   Options
       The following option is recognized:

	      Specify the repository to which the operation is to be applied.
		     Supported repositories include and

   Security Restrictions
       You must have appropriate privileges to use the optional login-name argument to change another user's login shell.

NETWORKING FEATURES

   NFS
       File can be implemented as a Network Information Service (NIS) database.

EXAMPLES

       To change the login shell for user to the default:

       To change the login shell for user to the C shell:

       To change the login shell for user to the Korn shell in the DCE registry:

WARNINGS

       If two or more users try to write the file at the same time, a passwd locking mechanism was devised.  If this locking  fails  after  subse-
       quent retrying, terminates.

AUTHOR

       was developed by HP and the University of California, Berkeley.

FILES

SEE ALSO

       chfn(1), csh(1), ksh(1), passwd(1), sh(1), sh-posix(1), getusershell(3C), pam(3), passwd(4), shells(4).

																	   chsh(1)
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