let

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let

let evaluates and assigns the result of an arithmetic expression to a variable, similar to $(( )) but as a standalone command. let x=5+3 sets x to 8 without needing $ on the right-hand side. It's an older alternative that's less commonly used today than $(( )) or ((...)).

Note: ((x = 5 + 3)) is the modern equivalent of let x=5+3 and is generally preferred.

Example: let

bash

#!/bin/bash
let x=5+3
echo "x = $x"

let "y = x * 2"
echo "y = $y"

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expr
for Loop Over a List
Arithmetic Expansion $(( ))
C-Style for Loop
let
while Loop
bc for Floating-Point Math
until Loop
Comparison Operators
break and continue
Increment and Decrement
Looping Over Array Elements
Math Functions
Looping Over Command Output

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let

let

Chapter Quiz — Complete all 14 topics to unlock

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