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Full Discussion: script check the users in SHELL ?
Top Forums Shell Programming and Scripting script check the users in SHELL ? Post 302163294 by Karthikeyan_113 on Thursday 31st of January 2008 03:07:56 PM
Old 01-31-2008
MySQL Try this....
Hi

Below is the piece with which you can achieve your task.

Code:
while [[ -z $user ]]
do
echo "Enter the user name : "
read user
done

echo
echo "Validating the $user ..."
if [[ `grep -c $user /etc/passwd` -eq 0 ]]
then
   echo
   echo "ERROR : PLEASE ENTER A VALID USERNAME."
   echo "Exiting ..."
   exit 1
else
   echo
   echo "$user IS A VALID USER."
   echo "Checking whether the $user is logged on or not ..."
   echo
fi

if [[ `who | grep -c $user` -eq 0 ]]
then
   echo
   echo "$user IS NOT LOGGED INTO THE SERVER !!!"
   echo
   exit 0
else
   echo
   echo "$user IS LOGGED INTO THE SERVER !!!"
   echo
fi

Below are its execution steps.

Quote:
$ > check_user.sh
Enter the user name :
root

Validating the root ...

root IS A VALID USER.
Checking whether the root is logged on or not ...


root IS NOT LOGGED INTO THE SERVER !!!

$ >
==========
Thanks,
Karthikeyan.
==========
 

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LEARN ABOUT LINUX

shtool-echo

SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME

       shtool-echo - GNU shtool echo(1) extensional command

SYNOPSIS

       shtool echo [-n|--newline] [-e|--expand] string

DESCRIPTION

       shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold
       mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the
       gory details needed to find out the environment details under option -e.

OPTIONS

       The following command line options are available.

       -n, --newline
	   By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is
	   omitted.

       -e, --expand
	   If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the
	   following constructs are recognized:

	   %B  switch terminal mode to bold display mode.

	   %b  switch terminal mode back to normal display mode.

	   %u  the current user name.

	   %U  the current user id (numerical).

	   %g  the current group name.

	   %G  the current group id (numerical).

	   %h  the current hostname (without any domain extension).

	   %d  the current domain name.

	   %D  the current day of the month.

	   %M  the current month (numerical).

	   %m  the current month name.

	   %Y  the current year.

EXAMPLE

	#   shell script
	shtool echo -n -e "Enter your name [%B%u%b]: "; read name
	shtool echo -e "Your Email address might be %u@%h%d"
	shtool echo -e "The current date is %D-%m-%Y"

HISTORY

       The GNU shtool echo command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML)
       under the name buildinfo. It was later taken over into GNU shtool.

SEE ALSO

       shtool(1), echo(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-ECHO.TMP(1)
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