if else 語句

我在一些 if 語句中有一個 case 語句，但是在 if 語句中執行 case 語句後，循環結束。在 case 語句之後，它應該轉到數組上的下一個值。發生的是數組中的第一個值，在通過 if 語句 then case 之後，腳本完成而不是循環到數組中的其他值。

set -A arrs a b c d

num=`expr ${#arrs[*]} - 1`

for x in `seq 0 $num`
do

var1=`some command here`
var2=`some command here`
var3=`some command here`

if [[ "$var1" == "$var2" && "$var3" == "0" ]]; then

#do something here

elif [[ "$var1" == "$var2" && "$var3" != "0" ]]; then

echo "\nContinue?"
echo "[y/n]:\c"
read yes_no

case $yes_no in
[yY])
  echo "You answer yes."
  echo "Some text that will go to the text file" >> some_text.txt
break
;;
[nN])
  echo "you answered  no"
exit
;;
*)
 echo "\nTry again"
;;
esac

elif [[ "$var1" != "$var2" && "$var3" == "0" ]]; then

echo "\nContinue?"
echo "[y/n]:\c"
read no_yes

 case $no_yes in
 [yY])
  echo "You answer yes"
  echo "Some text that will go to the text file" >> some_text.txt
 break
;;
[nN])
  echo "you answered  no"
 exit
;;
*)
   echo "\nTry again"
;;
esac

else
 echo "Do back flip"
exit
fi

done

我不知道是否清楚，但是當您使用 break 和 exit 時，您可能會中斷循環

set -A arrs a b c d

num=`expr ${#arrs[*]} - 1`

for x in `seq 0 $num`
do

   var1=`some command here`
   var2=`some command here`
   var3=`some command here`

   if [[ "$var1" == "$var2" && "$var3" == "0" ]]
   then

       #do something here

   elif [[ "$var1" == "$var2" && "$var3" != "0" ]]
   then

       echo "\nContinue?"
       echo "[y/n]:\c"
       read yes_no

       case $yes_no in
           [yY])
               echo "You answer yes."
               echo "Some text that will go to the text file" >> some_text.txt
               break
               ;;
           [nN])
               echo "you answered  no"
               exit
               ;;
           *)
               echo "\nTry again"
               ;;
       esac

   elif [[ "$var1" != "$var2" && "$var3" == "0" ]]
   then

       echo "\nContinue?"
       echo "[y/n]:\c"
       read no_yes

       case $no_yes in
           [yY])
               echo "You answer yes"
               echo "Some text that will go to the text file" >> some_text.txt
               break
               ;;
           [nN])
               echo "you answered  no"
               exit
               ;;
           *)
               echo "\nTry again"
               ;;
        esac

   else

       echo "Do back flip"
       exit

   fi

done

您break在yes語句中添加，因此它正在退出for-loop，因此未完成對數組其餘部分的測試。只需break從“是”案例聲明中刪除即可。

我對您的程式碼進行了一些修改進行了測試，並得到了我認為是您預期的結果：

#!/bin/sh

arrs=(a b c d)

num=`expr ${#arrs[*]} - 1`

for x in `seq 0 $num`
do

var1=`echo "hi"`
var2=`echo "hi"`
var3=`echo "hi"`

echo "var1 equals: $var1"
echo "var2 equals: $var2"
echo "var3 equals: $var3"


if [[ "$var1" = "$var2" && "$var3" = 0 ]]
then

       #do something here
       echo "First check"

elif [[ "$var1" == "$var2" && "$var3" != 0 ]]
then

        echo "\nContinue?"
        echo "[y/n]:\c"
        read yes_no

        case $yes_no in
        [yY])
          echo "You answer yes."
          echo "Some text that will go to the text file" >> some_text.txt
        ;;
       [nN])
          echo "you answered  no"
        exit
       ;;
       *)
         echo "\nTry again"
       ;;
       esac

elif [[ "$var1" != "$var2" && "$var3" == 0 ]]
then

        echo "\nContinue?"
        echo "[y/n]:\c"
        read no_yes

         case $no_yes in
         [yY])
          echo "You answer yes"
          echo "Some text that will go to the text file" >> some_text.txt
       ;;
       [nN])
          echo "you answered  no"
         exit
        ;;
        *)
           echo "\nTry again"
        ;;
        esac

else
       echo "Do back flip"
       exit
fi

done

輸出（是測試）：

[root]# sh test.sh
var1 equals: hi
var2 equals: hi
var3 equals: hi
\nContinue?
[y/n]:\c
y
You answer yes.
var1 equals: hi
var2 equals: hi
var3 equals: hi
\nContinue?
[y/n]:\c
y
You answer yes.
var1 equals: hi
var2 equals: hi
var3 equals: hi
\nContinue?
[y/n]:\c
y
You answer yes.
var1 equals: hi
var2 equals: hi
var3 equals: hi
\nContinue?
[y/n]:\c
y
You answer yes.

輸出（無測試）：

[root]# sh test.sh
var1 equals: hi
var2 equals: hi
var3 equals: hi
\nContinue?
[y/n]:\c
n
you answered  no

引用自：https://unix.stackexchange.com/questions/186922