bash 中的case语法

 1 case  $variable-name  in
 2     pattern1)
 3         command1
 4         ...
 5         ....
 6         commandN
 7         ;;
 8     pattern2|pattern3|pattern4)
 9         command1
10         ...
11         ....
12         commandN
13         ;;            
14     [a-z])
15         command1
16         ...
17         ....
18         commandN
19         ;;
20     *)
21         command1
22         ...
23         ....
24         commandN
25         ;;           
26     esac