How to use Shell script for Loop statement
This article focuses on "how to use Shell script for loop statements", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "how to use Shell script for loop statement"!
Like other programming languages, Shell supports for loops.
The general format of the for loop is:
The code is as follows:
For variable name in list
Do
Command1
Command2
...
CommandN
Done
When the variable value is in the list, the for loop executes all commands once, using the variable name to get the current value in the list. The command can be any valid shell command and statement. The in list can contain substitutions, strings, and file names.
The in list is optional, and if you don't use it, for circulates the command line position arguments.
For example, sequentially output the numbers in the current list:
The code is as follows:
For loop in 1 2 3 4 5
Do
Echo "The value is: $loop"
Done
Output:
The value is: 1
The value is: 2
The value is: 3
The value is: 4
The value is: 5
Sequentially output characters in a string:
The code is as follows:
For strin 'This is a string'
Do
Echo $str
Done
Output:
This is a string
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