启动后台进程并检查它何时结束

Question

如何在后台启动进程并检查它何时在 bash 脚本中结束？我的想法是这样的脚本：

launch backgroundprocess &
while [ Process is running ];do
   echo "PROCESS IS RUNNING\r"
done;

echo "PROCESS TERMINATED"

Answer 1

关键是“等待”命令：

#!/bin/bash

/my/process &
/another/process &
wait
echo "All processes done!"

Answer 2

有了wait你可以有粒度，您需要：

sleep 1 &
PID1=$!
sleep 2 &
PID2=$!

wait $PID1
echo 'PID1 has ended.'
wait
echo 'All background processes have exited.'

Answer 3

这是一种方法：

launch backgroundprocess &
PROC_ID=$!

while kill -0 "$PROC_ID" >/dev/null 2>&1; do
    echo "PROCESS IS RUNNING"
done
echo "PROCESS TERMINATED"
exit 0