bash/Linuxfor循环不像我希望的那样工作

Question

有人能告诉我为什么不起作用吗？

其主要目的是找到chapterNumber的索引。

chapter_number_arr=(ch-01 ch-02 ch-03 ch-04 ch-05 ch-06 ch-07 ch-08 ch-09 ch-10)
chapterNumber=ch-09

     for chapter_number in "${chapter_number_arr[@]}" ; do
        if [[ $chapter_number == "$chapterNumber" ]] ; then 
                index_file_name=$index2; 
        fi;
     done  

Answer 1

chapter_number_arr=(ch-01 ch-02 ch-03 ch-04 ch-05 ch-06 ch-07 ch-08 ch-09 ch-10)
chapterNumber=ch-09

for chapter_idx in "${!chapter_number_arr[@]}"; do
  if [[ ${chapter_number_arr[$chapter_idx]} = "$chapterNumber" ]]; then
    index_file_name=$chapter_idx
  fi
done

...will set index_file_name=8.从问题中可以看出，这就是您想要的(这是与chapter_number_arr对应的chapterNumber索引)。