Perform arithmetic on shell variables.

Syntax letexpression[expression]

Each *expression* is an arithmetic expression to be evaluated. If the last *expression* evaluates to 0, `let`

returns 1; otherwise 0 is returned.

let is very similar to (( - the only difference being let is a builtin (simple command), and (( is a compound command.

The arguments to let are therefore subject to all the same expansions and substitutions as any other simple command - requiring proper quoting and escaping - whereas the contents of (( aren't subject to word-splitting or pathname expansion (almost never desirable for arithmetic). For this reason, the arithmetic compound command should generally be preferred over let.

let is a bash builtin command.

*"Arithmetic is being able to count up to twenty without taking off your shoes" ~ Mickey Mouse*

expr - Evaluate expressions.

eval - Evaluate several commands/arguments.

test - Evaluate a conditional expression.

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