在POSIX sh中替换bash数组和C样式的循环 [英] Replacing bash arrays and C-style for loops in POSIX sh

问题描述

我想将以下bash代码转换为纯shell脚本(sh)语言，以便它应由其他脚本语言模式(即破折号脚本)运行.

I want to convert following bash code in pure shell script (sh) language so that it should run by other script language mode i.e dash script.

arguments=("$@")
for (( i=0; i<$#; i++ )); do
  case "${arguments[$i]}" in
    -foo)
    let "i = i + 1"
    echo "${arguments[$i]}"
      ;;
    *)                                                                                        
      break
  esac
done 

上面的代码可以在bash模式下很好地运行，但是会在破折号模式下出现错误.

above code finely run in bash mode but through an error on dash mode.

2: ./orig.sh: Syntax error: "(" unexpected

现在，如果我更改第2行以摆脱错误，如下行

Now If I change line 2 to get rid the error as following line

arguments="$@"

但是现在我又遇到了关于循环的错误

But now I got another error about loop

 3: ./orig.sh: Syntax error: Bad for loop variable

推荐答案

POSIX sh不支持数组或C样式的循环.

POSIX sh doesn't support arrays or C-style for loops.

i=0
while [ $(( ( i += 1 ) <= 10 )) -ne 0 ]; do
  eval "val=\$$i"
  case "$val" in
    -foo)
      i=$(( i + 1 ))
      eval "val=\$$i"
      echo "$val"
      ;;
    *)                                                                                        
      break
  esac
done 

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