You don’t have to type a range of numbers by hands!

BASH already has a built-in utility, named `seq`

, for generating and printing a sequence of numbers.

## Generate a sequence of numbers

Syntax: **seq [OPTION]… FIRST**

Syntax: **seq [OPTION]… FIRST LAST**

Print a sequence of numbers from 1 to 10:

$ seq 1 5 1 2 3 4 5

## Generate a sequence of numbers with increment

Syntax: **seq [OPTION]… FIRST INCREMENT LAST**

Print a sequence of numbers from 0 to 20 with increment 5:

$ seq 0 5 20 0 5 10 15 20

## Equalize width by padding with leading zeroes

Syntax: **seq -w…**

Equalize width by padding with leading zeroes:

$ seq -w 1 10 01 02 03 04 05 06 07 08 09 10

## Use another separator

Syntax: **seq -s SEPARATOR…** – use SEPARATOR to separate numbers.

Default separator is a new line – `"\n"`

.

Use space to separate numbers:

$ seq -s " " 1 10 1 2 3 4 5 6 7 8 9 10