Question

我在执行这个打印'hello'的bash脚本时遇到错误，直到后台进程继续执行。

ps command not found

我之前已经做了几次，但不确定为什么我这次会收到错误。

./a.sh &
while ps -p $! > /dev/null; do
       echo hello
done

Answer 1

这并不能解决您明显的PATH问题，但除了重复调用ps之外，还有一种更简单的方法可以解决问题。

# Start your script in the background, remembering its process ID
./a.sh & A_PID=$!

# Start another background job that echos hello (once per second, to
# avoid a flood of hellos). Remember its process ID as well
( while : ; do echo hello; sleep 1 done ) & LOOP_PID=$!

# Now wait for a.sh to finish...
wait $A_PID

# ... and kill the hello job
kill $LOOP_PID

Answer 2

调试此问题我建议以下

 nohup ./a.sh &
 p1=$!

 while ps -p $p1 
 do
    echo hello
    sleep 1
 done

错误：在bash中找不到ps命令

2 个答案: