Select, loop sentence structure summary
Select sentence: if,case,select.
Loop statement: for,while,until.
Note: the following variable is named var
Forward + reverse structure: if,case
If format:
If condition judgment
Then
Content
Elif
Then
Content
Else
Content
Fi
Case format:
Case $var in
1).
2).
...
*).
Esac
Do + done structure: for,while,until,select
For format:
For var in list
Do
Content
Done
While format:
While condition judgment-"if true, enter the cycle."
Do
Content
Done
Until format:
Until condition judgment-"if false, enter the cycle
Do
Content
Done
Select format:
Select var in list
Do
Break
Done
