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Ubuntu Unleashed 2014 Edition: Covering 13.10 and 14.04,Ninth Edition by Paul Hudson, Andrew Hudson, Matthew Helmke

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The if Statement

The if statement evaluates a logical expression to make a decision. An if condition has the following format in pdksh and bash:

if [ expression ]; then    Statementselif [ expression ]; then    Statementselse    Statementsfi

The if conditions can be nested. That is, an if condition can contain another if condition within it. It isn’t necessary for an if condition to have an elif or else part. The else part is executed if none of the expressions that are specified in the if statement and are optional if subsequent elif statements are true. The word fi is used to indicate the end of the if statements, which is very useful if you have nested if conditions. In such a case, you should be able to match ...

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