am a new to shell scripting. How do I check for NULL value in a Linux or Unix shell scripts?
y shell script depends upon user input. How do I find out if a variable called $_JAIL path is empty under a Linux / Apple OS X / Unix like operating systems? Can you tell me command on bash shell to find out if a variable is empty?
How do I set or create variables within my shell script or at command line under Linux and Unix like operating systems?