如何獲取後臺進程的PID?

我從shell腳本啓動了一個後臺進程,我想在腳本結束後終止該進程。 shell

如何從個人shell腳本中獲取此過程的PID? 據我所見變量$! 包含當前腳本的PID,而不是後臺進程。 bash


#1樓

您也許還能夠使用pstree: spa

pstree -p user

一般,這會爲「用戶」提供全部進程的文本表示形式,而-p選項會給出進程ID。 據我瞭解,它並不依賴於當前Shell擁有進程。 它還顯示了叉子。 code


#2樓

這就是我所作的。 檢查一下,但願對您有所幫助。 進程

#!/bin/bash
#
# So something to show.
echo "UNO" >  UNO.txt
echo "DOS" >  DOS.txt
#
# Initialize Pid List
dPidLst=""
#
# Generate background processes
tail -f UNO.txt&
dPidLst="$dPidLst $!"
tail -f DOS.txt&
dPidLst="$dPidLst $!"
#
# Report process IDs
echo PID=$$
echo dPidLst=$dPidLst
#
# Show process on current shell
ps -f
#
# Start killing background processes from list
for dPid in $dPidLst
do
        echo killing $dPid. Process is still there.
        ps | grep $dPid
        kill $dPid
        ps | grep $dPid
        echo Just ran "'"ps"'" command, $dPid must not show again.
done

而後只需以適當的權限將其運行爲: ./bgkill.sh it

root@umsstd22 [P]:~# ./bgkill.sh
PID=23757
dPidLst= 23758 23759
UNO
DOS
UID        PID  PPID  C STIME TTY          TIME CMD
root      3937  3935  0 11:07 pts/5    00:00:00 -bash
root     23757  3937  0 11:55 pts/5    00:00:00 /bin/bash ./bgkill.sh
root     23758 23757  0 11:55 pts/5    00:00:00 tail -f UNO.txt
root     23759 23757  0 11:55 pts/5    00:00:00 tail -f DOS.txt
root     23760 23757  0 11:55 pts/5    00:00:00 ps -f
killing 23758. Process is still there.
23758 pts/5    00:00:00 tail
./bgkill.sh: line 24: 23758 Terminated              tail -f UNO.txt
Just ran 'ps' command, 23758 must not show again.
killing 23759. Process is still there.
23759 pts/5    00:00:00 tail
./bgkill.sh: line 24: 23759 Terminated              tail -f DOS.txt
Just ran 'ps' command, 23759 must not show again.
root@umsstd22 [P]:~# ps -f
UID        PID  PPID  C STIME TTY          TIME CMD
root      3937  3935  0 11:07 pts/5    00:00:00 -bash
root     24200  3937  0 11:56 pts/5    00:00:00 ps -f

#3樓

pgrep能夠爲您獲取父進程的全部子PID。 如前所述, $$是當前腳本的PID。 所以,若是您但願腳本在執行後自行清理,則能夠作到這一點: 後臺

trap 'kill $( pgrep -P $$ | tr "\n" " " )' SIGINT SIGTERM EXIT

#4樓

您能夠使用jobs -l命令轉到特定的jobL 變量

^Z
[1]+  Stopped                 guard

my_mac:workspace r$ jobs -l
[1]+ 46841 Suspended: 18           guard

在這種狀況下,46841是PID。 List

來自help jobs權限

-l報告做業的進程組ID和工做目錄。

jobs -p是另外一個僅顯示PID的選項。


#5樓

  • $$是當前腳本的pid
  • $! 是最後一個後臺進程的pid

下面是一個bash會話樣本成績單( %1是指後臺進程的序號從看到jobs ):

$ echo $$
3748

$ sleep 100 &
[1] 192

$ echo $!
192

$ kill %1

[1]+  Terminated              sleep 100
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