How to see the location of a program currently running?

[chuckee]

Hi,
I have a few installations of MailScanner which I have done over several months. I know MailScanner is running, and can it see it appear using 'top' whenever someone sends an email, but how do I find out exactly *which* MailScanner installation it is running?
e.g. if I have one MailScanner installed at /directory1 and another MailScanner installed at /directory2 then how do I see which one is actually appearing in 'top'.
This is probably a rather basic/dumb question so apologies...

[hugortega]

You can use the /proc filesystem like this:

cat /proc/[the_pid_of_your_program]/cmdline

Of course, [the_pid_of_your_program] can be obtainer from top or ps.

Another option is:

head -1 /proc/[the_pid_of_your_program]/maps

Hugo

[sathiya]

while seeing the top command, press "c" .. it will display the path...


is it showing ??? reply us..

[chuckee]

Sathiya: thanks for the info about 'top' - pressing 'c' shows more info for most processes running but when it comes to MailScanner it still doesn't show the path. Instead it shows things like "Mailscanner: waiting for messages" and "Mailscanner: checking with SpamAssassin".

Hugo: using cat /proc/[the_pid_of_your_program]/cmdline shows the same messages as above.
The 'head' command, for some reason, shows:
08048000-08148000 r-xp 00000000 08:05 1737038 /usr/bin/perl

Cheers

[Japser]

Just to mention it: there is a command "which" .
--Japser.

[hugortega]

Hugo: using cat /proc/[the_pid_of_your_program]/cmdline shows the same messages as above.
The 'head' command, for some reason, shows:
08048000-08148000 r-xp 00000000 08:05 1737038 /usr/bin/perl

That's because your program is a perl script, and the *real* program is /usr/bin/perl just using a file with the script... maybe using:

sudo lsof | grep perl

helps to find the exact script file that perl is running.

Hugo