#!/bin/bash  for file in $(ls /tmp/test/mytest |grep sh)  //for in格式是shell for的基本格式，根js的for in類似 do        //循環開始你就把它當成{  echo $file done       //循環結束你就把它當成}  for ((i=0;i<10;i++))    //注意是雙小括號，由于受其他語言的影響，很容易搞錯 do  echo -n $i done  echo /   //輸出換行  for i in 0 1 2 3 4 5 6 7 8 9 do  echo -n $i done  echo /  for i in "0 1 2 3 4 5 6 7 8 9"  //這個根上面是有區別的，這個循環只循環了一次，雙引號里面只是一個變量 do  echo -n $i done  exit 0 

#!/bin/bash i=0 while ((i<10)) do  echo $i  ((i += 1)) done  i=0 while [ $i -lt 10 ] //注意括號內側二邊的空格 do  echo $i  let "i+=1"  //加1 done exit 0 

#!/bin/bash  END_CONDITION=end until [ "$var1" = "$END_CONDITION" ] //讀取的變量根設定的變量相等時退出循環，不然永遠循環 do  echo "Input variable #1 "  echo "($END_CONDITION to exit)"  read var1  echo "variable #1 = $var1"  echo done  exit 0 

#!/bin/bash  echo "Input a number #1 " read num echo "variable #1 = $num"  if [ $num -lt 60 ]  //注意lt前面的-，很容易忘的 then  echo "you are not pass" elif [ $num -lt 70 ] && [ $num -ge 60 ] //多個條件的判斷 then  echo "pass" elif [[ $num -lt 85 && $num -ge 70 ]] //如果放在一起，要注意是雙方括號，不要寫成[ $num -lt 85 && $num -ge 70 ] then  echo "good" elif (( $num <= 100 )) && (( $num >= 85 )) //對于有語言基礎的人來說，這種寫法讓人覺得很舒服，不要忘了是雙小括號 then  echo "very good" else  echo "num is wrong" fi                 //if要有結束標簽的，根XML很像,不閉合，就報錯  exit 0

#!/bin/sh case $1 in  start)  echo "start ok"  ;;    //注意一點，要注意是雙分號  stop)  echo "stop ok"  ;;  restart)  echo "restart ok"  ;;  *)  echo "no param"  ;; esac   //注意閉合標簽 exit 0  [root@krlcgcms01 forif]# sh c1.sh stop stop ok