How to write your first Shell Script in linux?
By: Vivek G. in Linux Tutorials on 2011-01-09
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
chmod permission your-script-name
$ 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 assyntax:
$ bash bar
$ sh 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
$ . foo
Now you are ready to write first shell script that will print "Knowledge is Power" on screen.
$ vi first # # My first shell script # clear echo "Knowledge is Power"
After saving the above script, you can run the script as follows:
This will not run script since we have not set execute permission for our script first; to do this type command
$ chmod 755 first $ ./first
First screen will be clear, then Knowledge is Power is printed on screen.
|$ vi first||Start vi editor|
# My first shell script
|# followed by any text is considered as comment. Comment gives more information about script, logical explanation about shell script.
|clear||clear the screen|
|echo "Knowledge is Power"||To print message or value of variables on screen, we use echo command, general form of echo command is as follows
Tip: For shell script file try to give file extension such as .sh, which can be easily identified by you as shell script.
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