I suppose we can say that we are now into the fine print of the script. These are the details that are written into our scripts using conditions to test if a statement should run or not. We are now ready to add some intelligence in scripts so our scripts become more robust, easier to use, and more reliable. Conditional statements can be written with simple command-line lists of AND or OR commands together or, more often, within traditional if statements.
In this chapter we will cover the following topics:
Simple decision paths using command-line lists
Verifying user input with lists
Using the test shell built-in
Creating conditional statements using
ifExtending
ifwithelseMore conditions with
elifCreating the
backup.shscript usingelifUsing case statements
Script – front-end with
grep