How to use the Linux seq command

1. Command Introduction

The seq (Sequence) command is used to generate all integers from the starting number to the ending number according to the specified step size. The default value 1 can be used for the start number and step size, but the end number must be specified.

2. Command format

seq [OPTION]... LAST
seq [OPTION]... FIRST LAST
seq [OPTION]... FIRST INCREMENT LAST

3. Option Description

Note that mandatory arguments for long options are mandatory for short options as well.

-f, --format=FORMAT
 Use printf-style floating point format -s, --separator=STRING
 Separate numbers using the specified string (default: \n)
-w, --equal-width
 Add 0 to numbers to make them the same width --help
 Display this help message and exit --version
 Display version information and exit

4. Common Examples

(1) Output 1 to 5.

seq 5
# or seq 1 5
# or seq 1 1 5

(2) Generate a sequence of integers from 10 to 50 with a step size of 10.

seq 10 10 50
10
20
30
40
50

(3) Output in the specified format num%03g. num is the prefix string, %03g means the number width is 3, if it is less than 3, 0 will be added in front.

seq -f"num%03g" 3
num001
num002
num003

(4) Add leading zeros to make the numbers have the same width.

seq -w 9 11
09
10
11

Note that you cannot specify a format string when outputting a fixed-width string, that is, -w and -f cannot be used together.

(5) Use the specified string to separate numbers.

seq -w -s "," 9 11
09,10,11

(6) Use Tab to separate numbers.

seq -s "`echo -e '\t'`" 9 11
9 10 11

First use the command to create a Tab, and then specify it as a separator.

References
[1] seq(1) manual
[2]【Linux】Learn Linux step by step——seq command (221)

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.