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UNIX KSH 脚本中是否有“Goto”？

发布于 2024-11-27 00:31:25 字数 77 浏览 1 评论 0原文

KSH 中有没有办法退出 case 语句并转到某一行以便下次执行代码？或者有可以使用的 goto 标签吗？使用类似的东西而不是嵌套大量分支？

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只是我以为 2024-12-04 00:31:25

虽然发布问题的简化示例总是有帮助的（但这涵盖了您期望的所有意外情况），但考虑到您对 Mark Read 的评论回复，您可以将输入提示包装到 while 循环中，例如

while ${keepTrying:-true} ; do
   echo "enter Yes or No"
   read yOrN
   case "${yOrN} in
     [Yy]* ) 
       # do something 
       keepTrying=false
     ;;
     [Nn]* )
       # do something else
        keepTrying=false
    ;;
     * )
       echo "bad input"
     ;;
   esac
done

# continue with script
# ....

另外，我同意 Mark， ksh 中没有标签或 goto。

我希望这有帮助。

While it always helps to post a simplified example of your problem (but that covers all contingencies you expect), given your comment reply to Mark Read, you can wrap the prompting for input into a while loop, like

while ${keepTrying:-true} ; do
   echo "enter Yes or No"
   read yOrN
   case "${yOrN} in
     [Yy]* ) 
       # do something 
       keepTrying=false
     ;;
     [Nn]* )
       # do something else
        keepTrying=false
    ;;
     * )
       echo "bad input"
     ;;
   esac
done

# continue with script
# ....

Also, I agree with Mark, no labels or gotos in ksh.

I hope this helps.

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说谎友 2024-12-04 00:31:25

没有标签或跳转。但是，您可以通过将数字传递给“break”内置函数来退出深度嵌套循环：break 2 退出两级，break 3 退出三级，等等。

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夜清冷一曲。 2024-12-04 00:31:25

有一个 bash goto 实现，如果你想使其适应 ksh （我到目前为止还没有）

#!/bin/bash

function gowto
{
    label=$1
    # works in Linux bash, but barks in ksh
    cmd=$(sed -n "/#$label:/{:a;n;p;ba};" $0 | grep -v ':
)
    #
    eval "$cmd"
    exit
}

echo step 1

gowto skip

echo To be skippped

#skip:

echo Step 2

There is a bash goto implementation, if you want to adapt it to ksh (I haven't so far)

#!/bin/bash

function gowto
{
    label=$1
    # works in Linux bash, but barks in ksh
    cmd=$(sed -n "/#$label:/{:a;n;p;ba};" $0 | grep -v ':
)
    #
    eval "$cmd"
    exit
}

echo step 1

gowto skip

echo To be skippped

#skip:

echo Step 2

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意中人 2024-12-04 00:31:25

我创建了名为 GOTO.ksh 的以下脚本：

#!/bin/ksh
#set -xv

OLD="$0"
NEW=/tmp/_$(basename "$0")
rm -f "$NEW"

grep "^#GOTO " "$OLD" | while read A B C
do
    [ -f "$NEW" ] || cp "$OLD" "$NEW"
    # printf "A=$A\nB=$B\nC=$C\n\n"
    sed -e "/^#GOTO $B/,/^#$B/s@^@\#. @" < "$NEW" > "$NEW"x && mv "$NEW"x "$NEW"
done
[ -f "$NEW" ] && { echo rm \"$NEW\" >> "$NEW" ;sync ; exec ksh "$NEW" $@; }

在 ksh 脚本中，需要 goto（用于调试），我按如下方式调用它：

. ~/bin/GOTO.ksh

现在，如果确实想跳过 ksh 命令，只需输入：

#GOTO labelA
.... commands to be skipped ....
#labelA

.... commands to be executed ....

#GOTO labelB
.... commands to be skipped ...
#labelB

如果脚本中，行将被注释掉，脚本将被写入 /tmp（前面带有“_”）并从那里执行。

I create the follwing script called GOTO.ksh:

#!/bin/ksh
#set -xv

OLD="$0"
NEW=/tmp/_$(basename "$0")
rm -f "$NEW"

grep "^#GOTO " "$OLD" | while read A B C
do
    [ -f "$NEW" ] || cp "$OLD" "$NEW"
    # printf "A=$A\nB=$B\nC=$C\n\n"
    sed -e "/^#GOTO $B/,/^#$B/s@^@\#. @" < "$NEW" > "$NEW"x && mv "$NEW"x "$NEW"
done
[ -f "$NEW" ] && { echo rm \"$NEW\" >> "$NEW" ;sync ; exec ksh "$NEW" $@; }

In the ksh script were the goto's are needed (for debugging) I invoke this as follows:

. ~/bin/GOTO.ksh

Now if one does want to skip ksh commands just put in:

#GOTO labelA
.... commands to be skipped ....
#labelA

.... commands to be executed ....

#GOTO labelB
.... commands to be skipped ...
#labelB

If there are #GOTO lines in the script, lines will be commented out, and the script will be written to /tmp (prepended with "_") and executed from there.

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