Use of the SEQ command

Used to produce all integers from one number to another
Example one:
# seq 1 10
The result is 1 2 3 4 5 6 7 8 9 10
Case TWO:
#!/bin/bash
For i in ' seq 1 10 ';
Todo
echo $i;
Done
or use
For I in $ (SEQ 1 10)
can also be 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 options specified format
#seq-F "%3g" 9 11
9
10
11
% the number of digits specified after the default is "%g",
"%3G" so the number of digits is not enough space
#sed-F "%03g" 9 11 so the number of digits is less than 0.
% before making strings
Seq-f "STR%03G" 9 11
str009
str010
STR011-W specifies that the output number is the same width cannot be used with-f
Seq-w-F "str%03g" 9 11
Seq:format string May is specified when printing equal width strings
SEQ-W 98 101
098
099
100
101
The output is the same width-s-specified delimiter is carriage return by default
Seq-s ""-F "str%03g" 9 11
str009 str010 str011
To specify/t as the separator symbol
Seq-s "' Echo-e"/t "'" 9 11 specifies/n/n as separator symbol
Seq-s "' Echo-e"/n/n "'" 9 11
19293949596979899910911
Got a wrong result.
But generally there is no need for it the default is to enter as a separator for several examples

awk ' BEGIN {while (num <) printf "dir%03d/n", ++num exit} ' | Xargs mkdir mkdir $ (seq-f ' dir%03g ' 1 10) For i in ' seq-f '%02g ' 1 20 ' Todo if! Wget-p $HOME/tmp-c [img]http://www.xxxsite.com/photo/$i. jpg[/img]; Then Wget-p $HOME/tmp-c $_ Fi Done

SEQ is a preset external command in Linux that is used as a simple method of writing a bunch of numbers, such as
Seq 1 10
will appear
1
2
3
4
5
6
7
8
9
10
And it 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, such as one-time system to make 10 famous dir001, dir002. DIR010 's catalogue, it is very useful, we can
So the next command is available.
Seq-f ' dir%03g ' 1 10 | Xargs mkdir
Or
mkdir $ (seq-f ' dir%03g ' 1 10)
It's in printf format,%03g ' represents a three-bit floating point, in this way, as with BASH3 printf
can also serve as a price order.
printf ' dir%03d/n ' {1..10} | Xargs mkdir or mkdir ' printf ' dir%03d ' {1..10} '
Awk can, of course,
awk ' BEGIN {while (num <) printf "dir%03d/n", ++num exit} ' | Xargs mkdir
It's faster than writing a foot, and you don't have to write
For DIR in 001 002 003 004 005 006 007 008 009 010
Todo
mkdir Dir${dir}
Done
I also used to download some of the use of seq jpeg, as long as the format has a number of words can be, especially in some XXX site;)
For i in ' seq-f '%02g ' 1 20 '
Todo
if! Wget-p $HOME/tmp-c [img]http://www.xxxsite.com/photo/$i. jpg[/img]; Then
Wget-p $HOME/tmp-c $_
Fi
Done

The-s option is mainly to change the output of the separator, the preset is/n, is newline
If you use-s to change, such as
Seq-s ' 1 10
1 2 3 4 5 6 7 8 9 10, with a space as the cell, but in the Gnu seq, it seems
Do not support/n,/t ... and other characters. If you use/n/n, with two spaces, you have to write
[Victor@localhost ~]$ seq-s '
>
> ' 1 5
1

2

3

4

5
/t will have to change the IFS, such as using/t/t
oifs= $IFS
Ifs= "/t/t"
Seq-s ' Echo-e $IFS ' 1 5
ifs= $OIFS
So is the other character.