如果其他人已在 bash 内完成，则终止脚本

Question

我正在尝试默默运行脚本和加载动画。我希望在执行初始脚本后停止加载动画，以便执行最终脚本。

run A.py |
         | --> message + ∞ load animation | --> run C.py (uses A & B output)
run B.py |

我已经完成了 80%，但我使用的方法是等待无限加载动画完成后再继续。显然，它永远不会结束，也永远不会继续（我有一个解决方法，但我不太喜欢它，我已经投入时间来尝试让当前的方法起作用）。

# Run these silently
python "/home/solebay/Project/script_a.py" &
python "/home/solebay/Project/script_b.py" &
pid=$!

# If this script is killed, stop the loading animation.
trap "kill $pid 2> /dev/null" EXIT

# While is running...
message=false
while kill -0 $pid 2> /dev/null; do
    if [ "$message" = false ]; then
      python "/home/solebay/Projects/loading_message.py" # print loading message
      message=true
    fi
    python "/home/solebay/Project/loading_animation.py" # Print looping animation
done
trap - EXIT

# Run the main script (dependent on script_a.py and script_b.py)
python "/home/solebay/Project/script_c.py"

我能否修改此方法以使其有效或是否不合适？我尝试过的一切最终只是将其恢复到 none 有效的状态。

实施 Léa Gris 的解决方案：

unset anim_pid
trap 'kill $anim_pid' EXT INT

python "/home/solebay/Project/loading_animation.py" & anim_pid=$!

python /home/solebay/Project/script_a.py & pid1=$!
python /home/solebay/Project/script_b.py & pid2=$!

# wait -n either task to finish
wait $pid1 $pid2
kill $anim_pid 2>/dev/null

printf '\n *** End of script ***\n'

Answer 1

wait -n pid pid 将等待任一 pid 完成
wait pid pid 将等待两个 pid 完成

#!/usr/bin/env bash

# Do not leave animation running in case script ends
unset anim_pid
trap 'kill $anim_pid 2>/dev/null' EXT INT

animation() {
  # loop until killed
  while :; do
    for frame in '|' '/' '-' \; do
      printf '\r%s' "$frame"
      sleep .25
    done
  done
}

task() {
  printf 'Hello I am task %d\n' ""
  LC_NUMERIC=C printf 'Task %d sleeping for %f seconds\n' "" ""
  sleep ""
  printf 'Task %d finished\n' ""
}

animation & anim_pid=$!

task 1 2.2 & pid1=$!
task 2 1.5 & pid2=$!

# wait both tasks to finish
wait $pid1 $pid2
kill $anim_pid 2>/dev/null
printf '\n *** End of script ***\n'

如果其他人已在 bash 内完成，则终止脚本

Kill a script if others have finished in bash

bash

if-statement

pid

kill

while-loop