Seq command usage in linux

Used to generate all integers between one number and the other.
Example 1:
# Seq 1 10
The result is 1 2 3 4 5 6 7 8 9 10.
Example 2:
#! /Bin/bash
For I in 'seq 1 10 ';
Do
Echo $ I;
Done
Or use
For I in $ (seq 1 10)
Yes.
Seq
-F, -- format = FORMAT use printf style floating-point FORMAT (default: % g)
-S, -- separator = STRING use STRING to separate numbers (default: \ n)
-W, -- equal-width equalize width by padding with leading zeroes
-F option specifies the format
# Seq-f "% 3g" 9 11
9
10
11
% The default number of digits after the specified number is "% g ",
"% 3g", less than a digit is a space
# Sed-f "% 03g" 9 11. If this is the case, less than 0 digits are allowed.
% String
Seq-f "str % 03g" 9 11
Str009
Str010
Str011
-W indicates that the output number is the same as the width and cannot be used together with-f.
Seq-w-f "str % 03g" 9 11
Seq: format string may not be specified when printing equal width strings
Seq-w 98, 101
098
099
100
101
The output is of the same width.
-S: the default Delimiter is carriage return.
Seq-s ""-f "str % 03g" 9 11
Str009 str010 str011
You must specify \ t as the separator.
Seq-s "'echo-e" \ t "'" 9 11
Specify \ n as the Separator
Seq-s "'echo-e" \ n "'" 9 11
19293949596979899910911
An error is returned.
However, this is not necessary. The default carriage return is used as the separator.
 
Examples
 
Awk 'in in {while (num <10) printf "dir % 03d \ n", ++ num; exit} '| xargs mkdir
Mkdir $ (seq-f'dir % 03g '1 10)
 
For I in 'seq-F' % 02g'1 20'
Do
If! Wget-P $ HOME/tmp-c [img] http://www.xxxsite.com/photo/polici.jpg#/img]; then
Wget-P $ HOME/tmp-c $ _
Fi
Done
 
 
Seq is an external command set by a Linux operating system. It is generally used as a batch of data, such
Seq 1 10
Then
1
2
3
4
5
6
7
8
9
10
It also has three options
-F, -- format = FORMAT use printf style floating-point FORMAT (default: % g)
-S, -- separator = STRING use STRING to separate numbers (default: \ n)
-W, -- equal-width equalize width by padding with leading zeroes
-F is most commonly used. For example, it is useful to create ten dir001, dir002... dir010 targets at a time. We can
In this case, the next command is ready.
Seq-f'dir % 03g '1 10 | xargs mkdir
Or
Mkdir $ (seq-f'dir % 03g '1 10)
It uses the printf format. % 03g represents three floating points. This method is used, for example, the printf of bash3.
It can also be used as a waiting command
Printf 'dir % 03d \ n' {1 .. 10} | xargs mkdir or mkdir 'printf' dir % 03d '{1 .. 10 }'
Awk certainly does.
Awk 'in in {while (num <10) printf "dir % 03d \ n", ++ num; exit} '| xargs mkdir
This is faster than creating a notebook, so you don't have to convert it
For dir in 001 002 003 004 005 006 007 008 009 010
Do
Mkdir dir $ {dir}
Done
I also use digital jpeg in seq, as long as the format has a sequential order of numbers, especially for some xxx sites.
For I in 'seq-F' % 02g'1 20'
Do
If! Wget-P $ HOME/tmp-c [img] http://www.xxxsite.com/photo/polici.jpg#/img]; then
Wget-P $ HOME/tmp-c $ _
Fi
Done
 
The-s option mainly changes the shard output. The Delimiter is \ n, Which is newline.
-S can be used for change, as shown in figure
Seq-s ''1 10
1 2 3 4 5 6 7 8 9 10, with space as the shard, but in the Gnu seq, it seems
\ N, \ t... and other characters are not supported? For example, use \ n and use two spaces to convert them
[Victor @ localhost ~] $ Seq-S'
>
> '1 5
1
 
2
 
3
 
4
 
5
\ T, you need to change IFS, for example, \ t
OIFS = $ IFS
IFS = "\ t"
Seq-s 'echo-e $ IFS '1 5
IFS = $ OIFS
Is the same for other characters?
 
 
The seq command is used to print a string of ordered numbers. It consists of the following three parameters:
 
-F, -- format = FORMAT
Use printf style floating-point FORMAT (default: % g)
-F: Specifies the print format:
For example:
[Root @ hao32] # seq-f % 05g 2 7
00002
00003
00004
00005
00006
00007
 
-S, -- separator = STRING
Use STRING to separate numbers (default: \ n)
-S: the default Delimiter is carriage return:
For example:
[Root @ hao32] # seq-s "" 2 7
2 3 4 5 6 7
 
-W, -- equal-width
Equalize width by padding with leading zeroes
-W outputs are supplemented with "0" when the front of the same width is insufficient, that is, they are aligned with the maximum number of digits.
For example:
[Root @ hao32] # seq-w 2 11
02
03
04
05
06
07
08
09
10
11