expr

Additional Notes

expr is a shell command used to evaluate expressions in shell scripts. It evaluates integer arithmetic, string comparisons, and regular expression matches in shell scripts. For most arithmetic, the $((...)) syntax is now preferred.

Syntax

expr [arguments]

Parameters

• options: Flags that change how expr behaves.
• arguments: Values consumed by the shell builtin or script command.
• command: Command line to run, test, wrap, or control.

Common Options

• --help: Show command help when supported.
• --version: Show version information when supported.

Examples

expr --help
man expr

Practical Notes

Options can vary by distribution and package version. Use man expr, expr --help, or the package documentation for exact syntax.