YouTipLinux Comm Let
# Linux let Command
[ Linux Command Manual](#)
## Command: let
The `let` command is a tool for arithmetic in BASH, used to evaluate one or more expressions. In variable calculations, you do not need to use `$` to represent the variable. If the expression contains spaces or other special characters, it must be quoted.
### Syntax Format
let arg [arg ...]
### Parameter Description:
arg: The expression to be evaluated.
### Examples:
Increment operation: **let no++**
Decrement operation: **let no--**
Shorthand forms **let no+=10, let no-=20** are equivalent to **let no=no+10, let no=no-20** respectively.
The following example calculates the two expressions `a` and `b`, and outputs the results:
#!/bin/bashlet a=5+4let b=9-3 echo $a $b
The execution result of the above example is:
9 6
[ Linux Command Manual](#)