Lesson 9

Date: 3/26/2014
Linux shell scripting tutorial
Linux for Engineering and IT Applications


Shell scripting exercises

  • Create a new directory bash_scripts where you will run the shell scripting exercises. 
    mkdir  bash_scripts
cd bash_scripts

    Note, it is recommended to create a new script file for every exercise; make them executable; give them names with extension .sh -- it is just a convention rather than a must. The first line of a bash script starts with 
    #!/bin/bash
    All non-executable comments in a script are prepended with # 
    # For example, we list all the files in the current directory
ls -la
ls -l /etc  # Comment. Here, we list files in /etc directory

  • Script scr1.sh is like a calculator: 
    #!/bin/bash
echo "I will work out X*Y"
echo "Enter X"
read X
echo "Enter Y"
read Y
echo "X*Y = $X*$Y = $[X*Y]"
    Make the script executable and run 
    chmod 755 scr1.sh
./scr1.sh


    References: for details, consult Bash Guide for Beginners

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