Three ways to split a string in a shell

Problem: String output of ' 1,2,3,4,5 ' is used, separated by 1 2 3 4 5

Feature: There are no spaces in the string

Workaround 1:

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1. #!/bin/bash
2. Var= ' 1,2,3,4,5 '
3. var=${var//,/} #这里是将var中的, replace with a space
4. for element in $var
5. Do
6. Echo $element
7. Done

If there is a space in the original string such as: ' Mark:x:0:0:this is a test user:/var/mark:nologin ' such a string, to be: delimited string output, the above method will be the This is a test user output, which is not correct.

For this scenario, workaround 2:

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1. #!/bin/bash
2. User= ' Mark:x:0:0:this is a test user:/var/mark:nologin '
3. For ((i=1;i<=7;i++))
4. Do
5. echo $user |cut-d ":"-f$i
6. Done

The above method is to determine the length of the string after the separation, if the writing is more general, to the following

Workaround 3:

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2. #!/bin/bash
4. User= ' Mark:x:0:0:this is a test user:/var/mark:nologin '
6. I=1
8. while ((1==1))
10. Do
12. Split= ' echo $user |cut-d ': '-f$i '
14. If ["$split"! = ""]
16. Then
18. ((i++))
20. Echo $split
22. Else
24. Break
26. Fi
28. Done

This method does not need to know the number of separated strings, with better versatility

Three ways to split a string in a shell