This post is collection of 10 useful unix / linux shell script code snippets I’ve often used.

Following these code snippet you will be able to answer following questions:
1. How to calculate script run-time in shell.
2. How to parse parameters / arguments to shell script.
3. How to safely change a directory in shell script.
4. How to check if a command was successful in shell script.
5. How to add timestamps in script log output.
6. How to check if a process is running.
7. How to colour your script output.
8. How to read variables from config file.
9. How to loop over files in a folder.
10. How to perform actions based on variable value using SWITCH…CASE

And a bonus snippet
11: How to send emails from shell script.

Let’s begin.
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