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let — Evaluate arithmetic expressions in shell. More information: <https://www.gnu.org/software/bash/manua

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the let command: Evaluate arithmetic expressions in shell. More information: <https://www.gnu.org/software/bash/manual/bash.html#index-let>.

Solution

let — Evaluate arithmetic expressions in shell. More information: <https://www.gnu.org/software/bash/manual/bash.html#index-let>.

Evaluate a simple arithmetic expression:

let "{{result = a + b}}"

Use post-increment and assignment in an expression:

let "{{x++}}"

Use conditional operator in an expression:

let "{{result = (x > 10) ? x : 0}}"

Display help:

let --help

Code Snippets

Evaluate a simple arithmetic expression

let "{{result = a + b}}"

Use post-increment and assignment in an expression

let "{{x++}}"

Use conditional operator in an expression

let "{{result = (x > 10) ? x : 0}}"

Display help

let --help

Context

tldr-pages: common/let

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