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Linux Shell Scripting Essentials
book

Linux Shell Scripting Essentials

by Sinny Kumari
November 2015
Beginner content levelBeginner
282 pages
5h 5m
English
Packt Publishing
Content preview from Linux Shell Scripting Essentials

Debugging your scripts

We write different shell scripts to perform different tasks. Have you ever encountered any errors while executing a shell script? The answer would be mostly yes! This is to be expected as it is practically impossible to always write perfect shell scripts, without errors or bugs.

For example, the following shell script is a buggy script while execution:

#!/bin/bash
# Filename: buggy_script.sh
# Description: Demonstrating a buggy script

a=12 b=8
if [ a -gt $b ]
then
  echo "a is greater than b"
else
  echo "b is greater than a"
fi

The following output is obtained after executing buggy_script.sh:

$ sh buggy_script.sh 
buggy_script.sh: line 6: [: a: integer expression expected
b is greater than a

From the output, we see that the error ...

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Publisher Resources

ISBN: 9781785284441Supplemental Content