Bash腳本在for循環后無法繼續

Question

我試圖用bash制作一個Mac Clippy。 這是我的一些代碼：

say "Hello there!"

declare -a assist_array=()

while true; do
  if pgrep -xq -- "Mail"; then
      assist_array+=('It looks like your trying to send an email. Would you like some help?')
  fi

  if pgrep -xq -- "Notes"; then
      assist_array+=('It looks like your trying to take a note. Would you like some help?')
  fi

  arraylength=${#assist_array[@]}
  for (( i=0; i<${arraylength}+1; i++ )); do
    echo ${assist_array[i]}
    say ${assist_array[i]}
    assist_array=()
  done

done

當我打開“郵件”時，它會回聲並說： "It looks like your trying to send an email. Would you like some help?" 然后換一行。 我同時打開了郵件和便箋。 我如何才能使其繼續掃描打開的應用程序而不會卡在for循環中？

Answer 1

您正在循環中清空數組。 結果，當嘗試下一次迭代時， ${assist_array[i]}要打印的內容。 如果需要清空數組，請在循環結束后執行。

同樣，數組索引從0到length-1 ，而不是從1到length 。 通常，您應該引用可能包含多個單詞的變量。

for (( i=0; i<${arraylength}; i++ )); do
    echo "${assist_array[i]}"
    say "${assist_array[i]}"
done
assist_array=()

Answer 2

我在您的代碼中看到兩個問題：

• 數組索引在Bash中以0開頭； 您的for循環使用1作為起始索引
• 不能修改for循環中的數組； 將數組重置命令放在外面

---

#!/bin/bash
while true; do
  assist_array=() # reset the array
  if pgrep -xq -- "Mail"; then
      assist_array+=('It looks like your trying to send an email. Would you like some help?')
  fi

  if pgrep -xq -- "Notes"; then
      assist_array+=('It looks like your trying to take a note. Would you like some help?')
  fi

  arraylength=${#assist_array[@]}
  for ((i=0; i<arraylength; i++)); do
    echo "${assist_array[i]}"
    say "${assist_array[i]}"
  done

  # probably put a sleep here
done

Answer 3

say "Hello there!"

declare -a assist_array=()

while true; do
  if pgrep -xq -- "Mail"; then
      assist_array+=('It looks like your trying to send an email. Would you like some help?')
  fi

  if pgrep -xq -- "Notes"; then
      assist_array+=('It looks like your trying to take a note. Would you like some help?')
  fi

  arraylength=${#assist_array[@]}
  for (( i=0; i<${arraylength}; i++ )); do
    echo ${assist_array[i]}
    say ${assist_array[i]}    
  done
  assist_array=()
done

上面的代碼應該為您工作。 問題在於數組是從零開始的，因此您對Assistant_array [2]的引用實際上是一個空字符串。 當您什么都不傳遞給“ say”時，它將顯示為stdin。

另外，正如其他答案所指出的（顯式或隱式），您正在初始化for循環內的數組。 您不應該這樣做，因為您還沒有讀完它。

因此，基本上，您只是堅持說等待標准輸入。 您可以按Ctrl-D結束當前程序上的標准輸入。