How To Write First UNIX Korn Shell Script Program

Q. Can you tell me how to write a UNIX korn shell script program? I'm new to UNIX scripting and HP-UX UNIX operating system.

A. Korn shell scripting under UNIX / Linux can be used to automate lots of stuff. It easy to write a shell script. You must know how to use a text editor such as vi to write a script.

Writing your first Korn shell script

Let us write a shell program to print knowledge is power on screen. Type the following command to open file:
vi hello.ksh
The first line should be as follows:

#!/bin/ksh

It is called a shebang. It consists of a number sign and an exclamation point character (#!), followed by the full path to the interpreter such as /bin/ksh. All scripts under UNIX execute using the interpreter specified on a first line.
Next append code as follows:

# A shell script to print message
# Written by Tom - Jan/13/2008
print "Knowledge is power"

Save and close the file. At the end your script should look like as follows:

#!/bin/ksh
# A shell script to print message
# Written by Tom - Jan/13/2008
# ------------------------------
print "Knowledge is power"

Set executable permission

Type the following command to set executable permission:
chmod +x hello.ksh

Run your korn shell script

Type the following command:
./hello.ksh
Sample output:

Knowledge is power