if条件判断和case条件判断模板

1.if条件判断实例
[root@node3 data]# vi install-php.sh
#!/bin/bash
#install php
install_php56() {
           echo "install php5.6......"
}

install_php70() {
            echo "install php7.0......"
}

install_php71() {
            echo "install php7.1......"
}

menu() {
        echo "======================"
        echo -e "\t1 php-5.6"
        echo -e "\t2 php-7.0"
        echo -e "\t3 php-7.1"
        echo -e "\tq exit"
        echo -e "\th menu"
        echo "======================"
        }
menu
while :
do
        read -p "version[1-3]: " version
        if [ "$version" = "1" ];then
                     install_php56
        elif [ "$version" = "2" ];then
                     install_php70
        elif [ "$version" = "3" ];then
                     install_php71
        elif [ "$version" = "q" ];then
                      exit
        elif [ "$version" = "h" ];then
                      clear
                      menu
        elif [ "$version" = "" ];then
                         :
        else
              echo "error"
        fi
done

2.case条件判断实例
[root@node3 data]# vi install-php-case.sh 
#!/bin/bash
#install php
install_php56() {
           echo "install php5.6......"
}

install_php70() {
            echo "install php7.0......"
}

install_php71() {
            echo "install php7.1......"
}

menu() {
        echo "======================"
        echo -e "\t1 php-5.6"
        echo -e "\t2 php-7.0"
        echo -e "\t3 php-7.1"
        echo -e "\tq exit"
        echo -e "\th menu"
        echo "======================"
        }
menu
while :
do
read -p "version[1-3]: " version
case "$version" in
        1)
                     install_php56;;
        2)
                     install_php70;;
        3)
                     install_php71;;
        q)
                     exit;;
        h)
                     clear;menu;;
        "")
                     ;;
        *)
                     echo "error"
esac
done