topic Re: System process in Operating System - Linux

System process

haeman — Thu, 17 Jan 2008 08:02:30 GMT

I know the path /proc have the user process in it , I use ll /proc and grep my login id , there are some process is display , but I found that some of these process is not real process , if I su other user then grep my_id again , it only display process id - 18257 , 18258 , these two process are really the process that I used in the system , can advise what make the difference ? how can I use my login id to grep my process without other unrelated process shown ?
Thx in advance.

$ ll /proc |grep my_id
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 14518
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 16816
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 18255
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 18256
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 18257
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 18258

su - ora_id
$ ll /proc |grep my_id
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 18257
dr-xr-xr-x 3 my_id edp 0 Jan 17 15:49 18258

Re: System process

Alexander Chuzhoy — Thu, 17 Jan 2008 08:19:54 GMT

1. When you do ll as my_id - you actually start another process as my_id, which isn't happening when you do ll as ora.

2. /proc has a directory for every process under it, but in general use `ps` with various options combinations like `ps aux` or `ps ef` to list running processes.

Re: System process

haeman — Thu, 17 Jan 2008 08:26:41 GMT

thx reply ,

except use ps , how can I make use the process in /proc to find the user process ?

Please advise . thx

Re: System process

haeman — Thu, 17 Jan 2008 08:27:43 GMT

--> When you do ll as my_id - you actually start another process as my_id, which isn't happening when you do ll as ora.

I know this is the reason , can advise how to solve it ? thx

Re: System process

Alexander Chuzhoy — Thu, 17 Jan 2008 08:50:04 GMT

I'm not sure how usefull it is, but here's the line:
for i in `ll /proc|grep |awk '{print $NF}'`; do test -d /proc/${i}; if [ $? -eq "0" ]; then echo $i; fi; done

replace the string with the username.

Re: System process

haeman — Thu, 17 Jan 2008 09:01:12 GMT

for i in `ll /proc|grep |awk '{print $NF}'`; do test -d /proc/${i}; if [ $? -eq "0" ]; then echo $i; fi; done

thx

I try your script above , it will display less unrelated process , but still have ONE unrelated process , can advise how to erase it ? thx

Re: System process

Alexander Chuzhoy — Thu, 17 Jan 2008 09:05:37 GMT

Check what command starts this process.
cat /proc//cmdline

Re: System process

haeman — Thu, 17 Jan 2008 09:10:44 GMT

--> cat /proc//cmdline

what is the use to check the command to start this process ?

thx

Re: System process

Alexander Chuzhoy — Thu, 17 Jan 2008 09:15:08 GMT

So that you'll know why this procees was started in the first place.
replace with the process number of the process that is bothering you.

Please assign points.

Re: System process

Stuart Browne — Thu, 17 Jan 2008 10:06:17 GMT

Why not just 'ps -u ' ? It'll get your processes.

If you just want the pid's, you can do that too with 'ps -u -opid='.

Re: System process

dirk dierickx — Fri, 18 Jan 2008 07:37:27 GMT

yeah, walking and searching proc seems more trouble then it's worth. just get the list of pids with 'ps' and then you know which directories in /proc to use for whatever you want to do.