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如果得到了输入就进行判断，如果给的是老鼠就说谢谢，如果不是老鼠就不要，并提示用户 # vi 2.3.2.sh #!/bin/sh #code by scpman #cat's food read -p "Please input the cat's food: " food if [ -n "$food" ] then echo the food:$food else echo You give cat a null fi if [ "$food" = 'laoshu' ] then echo 3Q,cat love laoshu elif [ "$food" = 'pig' ] then echo sorry,cat not love pig else echo cat not like others! Fi # sh 2.3.2.sh Please input the cat's food: You give cat a null #这里为空应该提示完直接退出？ cat not like others! #这一句怎么也输出了？ Shell: exit 脚本退出 # vi 2.3.3.sh #!/bin/sh #code by scpman #cat's food read -p "Please input the cat's food: " food if [ -n "$food" ] then echo the food:$food else echo You give cat a null exit ####看这里，#号代表注释，这样当条件走这时，就直接提示并退出 了 fi if [ "$food" = 'laoshu' ] then echo 3Q,cat love laoshu elif [ "$food" = 'pig' ] then echo sorry,cat not love pig else echo cat not like others! Fi # sh 2.3.3.sh Please input the cat's food: You give cat a null 这次就对了 # sh 2.3.3.sh Please input the cat's food: pig the food:pig sorry,cat not love pig scpman# sh 2.3.3.sh Please input the cat's food: lkjdslfldsf the food:lkjdslfldsf cat not like others! scpman# sh 2.3.3.sh Please input the cat's food: laoshu the food:laoshu 3Q,cat love laoshu 当然用不了，写这么多行，就能搞定，本书的所有例子，不要求有多少行，只要求思路清晰 希望大家少写NB的代码（只有自己想几次才看懂的代码！） 看到着，免得被大家骂，咱们赶紧来一个有用的例子吧！ (责任编辑：IT) |