Script lock functionality

Shell Programming and Scripting
1

Hi All,

My requirement is i have a script A.sh .When a person A runs the script A.sh it should get locked and person B should not run the script.
i followed the below code

f_script_lock()
{
process=$1
user=`ps -ef | grep -i "$process"  | grep -i 'ksh' | awk '{print $1;}'` 
	 if [ ! -z $user ]; then
        echo "Recovery  is handled by $user. Hence cannot proceed in Recovery" 
	 exit
	 else
	 continue
	 fi
}

The above is working fine in normal conditions.
But when person A runs the query and press Ctrl+C intermitently the code stops running.
When person B or even person A tries to execute the A.sh again after sometime it says it has been accessed by the user and not able to execute.
Please help me on this.

2

You might want to work with a lock file that is written to the filesystem and check if it exists or not. Maybe write the PID into it and if the file is existent, check if a process is still running with that PID etc.
Additionally you can use trap to intercept signals like that of ctrl+c.