Linux 如何通过`pstree`获取所有父进程和所有子进程
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how to get all parent processes and all subprocesses by `pstree`
提问by Congbin Guo
command pstree PIDcan show all subprocess information of the process specified by PID. However, I also want to know all parent process information of the process PID, how can I get it?
命令pstree PID可以显示指定进程的所有子进程信息PID。但是，我也想知道进程的所有父进程信息PID，如何获取？
An example, give below process:
一个例子，给出以下过程：
init |- parent_process | `- current_process | |- subprocess_1 | `- subprocess_2 `- other_process
What I want is when I run pstree current_process_pid, I want to get below output
我想要的是当我运行时pstree current_process_pid，我想要低于输出
init
`- parent_process
`- current_process
|- subprocess_1
`- subprocess_2
When I run pstree subprocess_1_pid, it will output
当我运行时pstree subprocess_1_pid，它会输出
init
`- parent_process
`- current_process
`- subprocess_1
Thanks in advance
提前致谢
回答by MeaCulpa
# With my psmisc 22.20:
pstree -p -s PID
Maybe if with ps -ef:
也许如果使用 ps -ef：
awk -vPID= '
function getParent ( pid ) {
if (pid == "" || pid == "0") return;
while ("ps -ef | grep "pid | getline) {
if ( == pid) {
print "("") Called By ";
getParent();
break;
}
}
close ("ps -ef")
}
BEGIN { getParent(PID) }
'
This is ugly assuming ps output column and order. Actually one single run of ps -ef contains all info needed. This don't worth the time, I still recommend updating psmisc, it won't hurt.
假设 ps 输出列和顺序，这很难看。实际上，一次运行 ps -ef 就包含了所有需要的信息。这不值得花时间，我仍然建议更新 psmisc，它不会受到伤害。
EDIT: A mimic using single run ps -ef:
编辑：使用单次运行 ps -ef 的模拟：
ps -ef | awk -vPID= '
function getpp ( pid, pcmd, proc ) {
for ( p in pcmd ) {
if (p == pid) {
getpp(proc[p], pcmd, proc);
if (pid != PID) printf("%s(%s)───", pcmd[pid], pid);
}
}
}
NR > 1 {
# pid=>cmd
pcmd[] = ;
# pid=>Parent
pproc[] = ;
}
END {
getpp(PID, pcmd, pproc);
printf "\n";
system("pstree -p "PID);
}'
回答by martemiev
I found lapsoptions mentioned by @haridsv (pstree -laps <pid>) being a solution. It was a bit verbose for me though, so I'd stick to a shorter apsoutput.
我发现laps@haridsv ( pstree -laps <pid>)提到的选项是一个解决方案。不过对我来说有点冗长，所以我会坚持使用较短的aps输出。
