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Bash Script to Check whether a user has an account in your system

Bash Script to Check whether a user has an account in your system

#!/bin/bash
# validuser.sh
# Usage: validuser.sh username
# Script to check whether suplied user has an account in your system

if [ $# -ne 1 ]
then
 echo "You supplied wrong arguments"
 echo "Usage : `basename $0` user_name"
exit 1
fi

#grep -w "$1" /etc/passwd > /dev/null
grep -w "^$1" /etc/passwd > /dev/null
if [ $? -eq 1 ]
then
 echo "$1 is not a valid user"
else
 echo "$1 is a valid user"
fi

# Using greps -q option you can simplify and faster your script
# if `grep -qw "^$1" /etc/passwd`
# greps -q option prints nothing just returns exit status 0 or 1

Out Put:
[root@localhost shell]# sh validuser.sh
You supplied wrong arguments
usage : validuser.sh user_name
[root@localhost shell]# sh validuser.sh venu
venu is a valid user
[root@localhost shell]# sh validuser.sh venuk
venuk is not a valid user
[root@localhost shell]# sh validuser.sh root
root is a valid user
[root@localhost shell]# sh validuser.sh roott
roott is not a valid user
[root@localhost shell]#

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