Case usage in shell

Case Statement in shell: it can match the variable content with multiple templates, and then decide which part of the code should be executed based on the template that matches successfully. Format of use for www.2cto.com: case matching mother board in template 1 [| template 2] & hellip;) statement group ;;...
Case Statement in shell: it can match the variable content with multiple templates, and then decide which part of the code should be executed based on the template that matches successfully. Format of www.2cto.com: case matching mother board in template 1 [| template 2]…) Statement group; template 3 [| Template 4]…) Statement group; the matching sequence of esaccase statements is from top to bottom. Therefore, the principle of case statement writing is from top to bottom, and the template is from special to common. In C, the case statement contains the default template. in shell programming, the template may be written as * to complete the same function. Www.2cto.com routine :#! /Bin/sh echo "Please input \" yes \ "or \" no \ "" read var case "$ var" in [yY] [eE] [sS]) echo "Your input is YES"; [nN] [oO]) echo "Your input is no"; *) echo "Input Error! "; Esac exit 0 Example 2 :#! /Bin/bashFRUIT = $1 # note that there is no space if [-z "$1"] # There must be a space in brackets and-z thenecho "there is no fruit input in the first parameter" elsecase" $ FRUIT "inapple | APPLE) echo "the fruit is apple"; banana | BANANA) echo "the frult is banana"; # you can use *) to indicate THE default options, note that we should end with two semicolons *) echo "is the input fruit I want? "; Esacfi #### $1 is the value of an external parameter, for example, when the script is run :. /test. sh apple #### here, apple is $1 ___________________________________________________________ another script to be learned #! /Bin/bash HOSTS = "nss. sh cs. sh SS. sh ds_handler2 tomcat blog httpd "for myHost in $ HOSTSdocount = ('PS aux | grep-v grep | grep $ myHost | wc-L') echo $ myHostecho $ countdone