ScriptingLesson 49Free preview

Bash If...Else

This lesson is part of Bash · All levels

Summary

The if branch checks a condition and then executes the command block accordingly. The structure begins with if, continues then, optional else or elliptic, and closes with fi. Conditions are generally written in square brackets that must be given spaces within parentheses.

Key points

Structure: if [condition]; then...; else...; fi
Space in square brackets must be there.
[[]] a more secure version of Bash for string
The ellipse replaces the otherwise-if repeated

Full lesson

Code examples and quizzes

Full lessons, code examples, and quizzes are available to subscribers. 5 questions.