ScriptingLesson 48Free preview

Bash Operators

This lesson is part of Bash · All levels

Summary

Bash operators include arithmetic operators, comparisons within the test, and logic operators. Note that the numerical comparison uses -eq, -lt, etc., whereas the string uses = and!= in square brackets. The logic operators &&, >, and! combine several conditions into one branch.

Key points

Arithmetic: add, subtract, multiply, divide, remaining in $(()
The comparison of numbers: -eq -ne -lt -le -gt -ge
Comparison of strings: = or!= and check -z and -n
Logic: && or, not, and,! the opposite

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