Following steps are required to write shell script:
(1) Use any editor like vi or mcedit to write shell script.
(2) After writing shell script set execute permission for your script as follows
Quotesyntax:
chmod permission your-script-name
QuoteExamples:
$ chmod +x your-script-name
$ chmod 755 your-script-name
Note: This will set read write execute(7) permission for owner, for group and other permission is read and execute only(5).
(3) Execute your script as
QuoteSyntax:
$ bash your-script-name
$ sh your-script-name
$ ./your-script-name
QuoteExamples:
$ bash bar
$ sh bar
$ ./bar
Note: In the last syntax ./ means current directory, But only . (dot) means execute given command file in current shell without starting the new copy of shell, The syntax for . (dot) command is as follows
QuoteSyntax:
. command-name
QuoteExample:
$ . foo
Now you are ready to write first shell script that will print "Milesweb Hosting Services" on screen. See the common vi command list , if you are new to vi.
Quote$ vi first
#
# My first shell script
#
clear
echo "Milesweb Hosting Services"
After saving the above script, you can run the script as follows:
Quote$ ./first
This will not run script since we have not set execute permission for our script first; to do this type command
Quote$ chmod 755 first
$ ./first
First screen will be clear, then following output will appear on screen.
QuoteOutput :
Milesweb Hosting Services