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Linux's seq command can generate a list of numbers at lightning speed, and it is easy to use and flexible.

One of the easiest ways to generate a list of numbers in Linux is to use the seq (Series sequence) command. In its simplest form, seq takes a numeric parameter and outputs a list from 1 to that number. For example:

$seq 5

one

two

three

four

five

Seq always starts with 1 unless otherwise specified. You can insert different numbers in front of the final number to start a sequence.

$seq 3 5

three

four

five

Specify increment

You can also specify incremental strides. Suppose you want to list multiples of 3. Specify the start point (the first 3 in this example), the increment (the second 3), and the end point (18).

$seq 3 3 18

three

six

nine

twelve

fifteen

eighteen

You can choose to use negative increments (that is, decrements) to change the number from large to small.

$seq 18-3 3

eighteen

fifteen

twelve

nine

six

three

The seq command is also very fast. You may be able to generate a list of a million numbers in 10 seconds.

$time seq 1000000123. 9999989999991000000real 0m9.290s

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