identity session in multiple vnc servers

avihuh · 12-13-2016, 01:53 AM

Hi,
I would like to create automation tool (bash file) that will run automatically in all our vnc-servers and will check by user where he has open sessions

Code:

ps aux | grep vnc | grep $user

how to start?
thnks

Turbocapitalist · 12-13-2016, 03:31 AM

Welcome to the forum

The utility pgrep can find the process id for you based on your search criteria.

Code:

pgrep -x vnc -u $user

That will give you a list of the process ids for the processes with the exact name "vnc". Which VNC server are they running, that will tell you which name to look for.

avihuh · 12-13-2016, 04:44 AM

Quote:

Originally Posted by Turbocapitalist

Welcome to the forum

The utility pgrep can find the process id for you based on your search criteria.

Code:

pgrep -x vnc -u $user

That will give you a list of the process ids for the processes with the exact name "vnc". Which VNC server are they running, that will tell you which name to look for.

I tried

Code:

pgrep -x vnc -u avihuh

couldn't find process
when I tried :

Code:

ps aux | grep avihuh | grep vnc

he found
what I'm doing wrong?

Turbocapitalist · 12-13-2016, 04:50 AM

Your search name is not found. The vnc has to be the exact name of the VNC server program that is running.

What is the output of the following?

Code:

pgrep -l -u avihuh vnc

That searches for any running program with "vnc" anywhere in the name for the user "avihuh"

Jjanel · 12-13-2016, 04:53 AM

The name might not be **exactly** vnc. Remove the -x (check man pgrep)
Check with: ps ax|grep vnc

Welcome to Linux! (IF you want, tell us a tiny bit about your 'distro', &Linux goals/interest)

p.s. A different idea/concept (see man ...): netstat -tap |egrep 'vnc|ESTAB'
(grep vnc /etc/services) Enjoy!

avihuh · 12-13-2016, 05:09 AM

Quote:

Originally Posted by Turbocapitalist

Your search name is not found. The vnc has to be the exact name of the VNC server program that is running.

What is the output of the following?

Code:

pgrep -l -u avihuh vnc

That searches for any running program with "vnc" anywhere in the name for the user "avihuh"

Code:

17499 Xvnc
17526 vncconfig

avihuh · 12-13-2016, 05:11 AM

Quote:

Originally Posted by Jjanel

The name might not be **exactly** vnc. Remove the -x (check man pgrep)
Check with: ps ax|grep vnc

Welcome to Linux! (IF you want, tell us a tiny bit about your 'distro', &Linux goals/interest)

p.s. A different idea/concept (see man ...): netstat -tap |grep vnc
(grep vnc /etc/services) Enjoy!

I'm familiar with what u suggested I will explain what I need
I need to create a script that will check in multiple servers if there is session for specific user

Turbocapitalist · 12-13-2016, 05:13 AM

Ok. Then you can find just the PIDs of the instances of Xvnc by using that exact name in your query:

Code:

pgrep -u avihuh -x Xvnc

As Jjannel suggest, perusing the manual page for pgrep can be a good idea. The -x will require an exact match but that is eventually what you need to avoid false matches.

avihuh · 12-13-2016, 05:16 AM

Quote:

Originally Posted by Turbocapitalist

Ok. Then you can find just the PIDs of the instances of Xvnc by using that exact name in your query:

Code:

pgrep -u avihuh -x Xvnc

As Jjannel suggest, perusing the manual page for pgrep can be a good idea. The -x will require an exact match but that is eventually what you need to avoid false matches.

actually my need is the session number, and I need it in multiple servers this command is for specific server

Turbocapitalist · 12-13-2016, 05:20 AM

Quote:

Originally Posted by avihuh

actually my need is the session number, and I need it in multiple servers this command is for specific server

Can you copy one line with that information as it is shown from regular ps and paste it here? You might need awk

avihuh · 12-13-2016, 05:31 AM

Quote:

Originally Posted by Turbocapitalist

Can you copy one line with that information as it is shown from regular ps and paste it here? You might need awk

attaced

Jjanel · 12-13-2016, 05:39 AM

Oh! I'm learning here! I *wrongly* thought you meant PID (by "session number"). This search:
vnc "session number"

A question on the "multiple servers": did you want this to run *from* a 'master' [server],
or did you want this to run 'autonomously' on all systems? (Do you want to collect the results?)
I'm thinking of concepts like nagios (tho I don't know nagios), vs. [topic search]:
"run command on multiple systems"? (like via ssh; do you have this setup already?)

Best wishes... Let us know how it goes...

avihuh · 12-13-2016, 05:44 AM

Quote:

Originally Posted by Jjanel

Oh! I'm learning here! I *wrongly* thought you meant PID (by "session number"). This search:
vnc "session number"

A question on the "multiple servers": did you want this to run *from* a 'master' [server],
or did you want this to run 'autonomously' on all systems? (Do you want to collect the results?)
I'm thinking of concepts like nagios (tho I don't know nagios), vs. [topic search]:
"run command on multiple systems"? (like via ssh; do you have this setup already?)

Best wishes... Let us know how it goes...

run from master server
collect the results
we already have multiples vnc servers here
and there are cases that someone forgot his port or event server so with that script I will be able to locate

Jjanel · 12-13-2016, 05:54 AM

Oh, I see now! I see *two* pieces to work on here:
1) get it working locally (research/web-search: get vnc session info)
(`vncserver -list` ?)
2) How will you 'access' the *multiple* other servers?
(do you have this setup/working already? [for any/simple-test command])

Best wishes.... Hopefully other LQ'ers, with more expertise on this than me, will come along.

Turbocapitalist · 12-13-2016, 05:55 AM

Ok. That's doable. Can you do ps auwx | grep Xvnc | head -n 1 and put it in [code] [/code] tags so we can see it as you see it on your set up?