Question

我想通过将其存储在变量中并将其导出或其他方式将父子进程ID报告给父级。这怎么可能？下面是一个小例子。

例子。

parent.sh
    ./child.sh &
     wait
     sleep 10
     echo $grandchild_pid

child.sh
    ./grandchild.sh &
     export grandchild_pid=$!

Answer 1

一种方法是使用FIFO：

tempdir=$(mktemp -t -d fifodir.XXXXXX) # tempdir for our named pipe
trap 'rm -rf "$tempdir"' EXIT          # ...arrange for it to be deleted on exit

mkfifo "$tempdir/child"                # create our temporary FIFO
./child.sh 3>"$tempdir/child" &        # start our background process, FD 3 to the FIFO

sleep 10                               # do whatever
read grandchild_pid <"$tempdir/child"  # read from the FIFO

echo "Our grandchild's PID is $grandchild_pid"

......以及child.sh：

./grandchild.sh 3>&- &  # start the grandchild in the background
(echo "$!" >&3 &)       # write PID to FD3 in background so we don't block on the parent
exec 3>&-               # close the FD from the child, so only the backgrounded echo has it

Answer 2

你可以找到所有的孙子＆＃34;像这样的过程：

{{1}}

Answer 3

一个解决方案，但不是最好的解决方案是将您的孩子和孙子的pids打印在文件上。然后父母可以捕获这个文件并获取数据。

一个小例子：

家长流程：

#!/bin/bash

echo "Im the parent"
rm .pids.childs

./child.sh &
wait


echo "my son is: $(cat .pids.childs | grep SON)"
echo "my gchild is: $(cat .pids.childs | grep GCH)"
echo "Parent Finish"
exit 0

子进程：

#!/bin/bash

echo "Im the child"
echo "SON_PID=$$" >> .pids.childs

./gchild.sh &
wait

echo "Child Finish"
exit 0

GrandChild流程：＃！/斌/庆典

echo "Im the gchild"

echo "GCH_PID=$$" >> .pids.childs

echo "gchild Finish"
exit 0

这不是一个很好的解决方案但它有效

将孙子进程ID报告给父bash

3 个答案: