Simple Service Check Script

[zemon]

I am trying to run a simple script to let me know if rtorrent is running under a user.

#!/bin/sh

SERVICE='rtorrent'
USER='0001'

if pgrep -u $USER $SERVICE > /dev/null
then
    echo "$SERVICE service is active"
else
    echo "$SERVICE is not active"
fi

The script always returns rtorrent is not active even though it clearly is.

Any help is welcome.

[zombykillah]

You may wannt change it into something like that:

#!/bin/sh

SERVICE='rtorrent'
USER='0001'

if [ -z $(pgrep -u $USER $SERVICE) ]
then
    echo "$SERVICE service is active"
else
    echo "$SERVICE is not active"
fi

Or (Ain't sure of that one)
But if I remember right $? is the exit code of the last command.
I don't know if "pgrep" will exit with an error if no process is found.

#!/bin/sh

SERVICE='rtorrent'
USER='0001'

pgrep -u $USER $SERVICE > /dev/null
if $?
then
    echo "$SERVICE service is active"
else
    echo "$SERVICE is not active"
fi

[ss81]

Hi,
You can try this code.

#!/bin/bash

SERVICE='rtorrent'
USER='0001'

srvchk=`pgrep -u $USER $SERVICE`
if [ $? -eq 0 ]
then
echo "$SERVICE service is active"
else
echo "$SERVICE is not active"
fi

[Kloschüssel]

Or you check if there's the .pid file created by rtorrent at startup, if so in that pid file should be the process id of rtorrent. Then you can check if a process with that id exists. Only then the rtorrent service is running.

Note: on a power loss rtorrent does not remove the .pid file and this leaves the pid file with a invalid process id that should be cleaned by the startup script.

Cheers

[jayd512]

Does it need to be a script?
I may be over-simplifying this, but how about just using top?

top | grep rtorrent

[Kloschüssel]

This is normally not enough. Thinking of the setup I have at home there's one instance of rtorrent that is started and run as a service with a dedicated session directory. Still each user could possibly start his own rtorrent instance on another free port and a different session directory. And even if this was not possible, I would not do:

top | grep rtorrent

but

ps -A | grep rtorrent

cheers

[jayd512]

Gotcha. And I see what you mean.
Guess I was thinking to simplistic.

[atreyu]

And to OP, if you are not worried just about the 'rtorrent' client, then I'd be a bit less specific about what I'm looking for.

For example, something like this would look for any instance that has 'torrent' somewhere in it, and return the name of the user responsible:

ps -eo user,cmd|awk '/torrent/{print $1}'

Also, keep an eye on open TCP ports:

netstat -tna

or with lsof:

lsof -i