nohup problem

[Gary L. Paveza, Jr.]

I'm trying to capture the PID of a process started via nohup. According to the man page for nohup, I should be able to do the following:

nohup (command1; command2)

However, when I try the following:

nohup (sleep 10; echo $!) &

I get the following error:

ksh: syntax error: '(' unexpected

Anyone know how I can get the PID for the first command?

[Steven E. Protter]

PID=$$

echo "Process ID: $PID:

Try command witout the parenthesis.

sEP

[Gary L. Paveza, Jr.]

without the parens it only nohups the first command, then executes the second. The variable $! returns the PID of the nohup command. I need the PID of the command started by nohup.

[Ken Penland_1]

how bout this:

nohup `sleep 10; echo $!` &

[Uday_S_Ankolekar]

Try without brackets

nohup sleep; echo $!) &


USA..

[Ken Penland_1]

naw, I see what his problem is, the echo $! returns the pid of the nohup, and not the sleep...hrm....I cant figure it out either.

[Uday_S_Ankolekar]

Ignore my previous post!

Try this instead:

nohup `(sleep 10; echo $!)` &

[Geoff Wild]

nohup `(sleep 10; echo $!)` &

That won't work - as ; seperates cmmands - serially - that is, nohup will do first command, after done, the second...


Only way I see is:

nohup command &
ps -ef |grep command |awk '{print $2}`

Rgds...Geoff

[Ken Penland_1]

why do you need to nohup it?

just typing:

sleep 10 &

then echo $! returns the correct number... when ya start including nohup it starts getting messy cause THAT is considered the last job that ran in the background

[Tom Danzig · Accepted solution]

If all you want is the pid of the nohup'ed process, it is stored in $!

i.e.

# nohup sleep 60 &
[1] 11187
# Sending output to nohup.out

# echo $!
11187

[Ken Penland_1]

thats not what he wants Tom, that gives you the pid of the nohup, not the pid of the SLEEP

[Geoff Wild]

actually, it does:

sha1:root:/ # nohup sleep 20 &
[1] 19692
sha1:root:/ # Sending output to nohup.out

sha1:root:/ # echo $!
19692
sha1:root:/ # ps -ef |grep 19692
root 19692 23610 0 13:30:13 pts/8 00:00 sleep 20


Rgds...Geoff

[Gary L. Paveza, Jr.]

Geoff,

That's exactly what I need. Thanks.

[Gary L. Paveza, Jr.]

Tom provided the solution and Geoff confirmed it.