Detailed explanation of the use of Linux seq command

01. Command Overview

The seq command is used to generate a sequence of integers.

02. Command format

usage:

 seq [options]... tailseq [options]... first number tailseq [options]... first number increment tailseq [options]...

03. Common options

Prints numbers starting from the first digit to the last digit in the specified increment.

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

04. Reference examples

4.1 Output 1-5

[deng@localhost ~]$ seq 5 
1
2
3
4
5
[deng@localhost ~]$ 

4.2 Output 1-5

[deng@localhost ~]$ seq 1 5
1
2
3
4
5
[deng@localhost ~]$ 

4.3 Output 3-5

[deng@localhost ~]$ seq 3 5 
3
4
5
[deng@localhost ~]$

4.4 Output 1 4 7 10

[deng@localhost ~]$ seq 1 3 10
1
4
7
10
[deng@localhost ~]$ 

4.5 Specifying the output format

[deng@localhost ~]$ seq -f "%3g" 9 11
 9
 10
 11
[deng@localhost ~]$

It means -f specifies the format, % specifies 3 digits after it, the default is %g, and spaces are used to fill in the places where %3g does not have enough digits

4.6 Specifying output format

[deng@localhost ~]$ seq -f "%03g" 9 11
009
010
011
[deng@localhost ~]$ 

This means printing three digits and filling the missing digits with 0.

4.7 Specifying the output format

[deng@localhost ~]$ seq -f "str%03g" 9 11
str009
str010
str011
[deng@localhost ~]$

It means to print three missing digits with 0 and add str in front.

4.8 Add 0 in front of columns to make them have the same width

[deng@localhost ~]$ seq -w 9 11
09
10
11
[deng@localhost ~]$ 
 

When outputting a fixed-width string, the format string should not be specified. -w and -f cannot be used together.

4.9 Use the specified string to separate numbers

[deng@localhost ~]$ seq -s " " -f "str%03g" 9 11
str009 str010 str011
[deng@localhost ~]$ 
 

4.10 Use the tab key to separate numbers

[deng@localhost ~]$ seq -s "`echo -e '\t'`" 9 11
9 10 11
[deng@localhost ~]$ 
 

First use the command to make a tab, and then specify it as a separator

05. Appendix

Reference: 【Linux】A summary of the series of tutorials on learning Linux step by step

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