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Old 12-06-2005, 12:19 AM   #1
varunbihani
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shell script to kill processes running on port number


I need a shell script that will find all the processes running on particular port number and then I want to kill those processes

Cmd1: lsof -i : <portnumber> (it will return the process ID)
cmd2: kill -9 <process ID>

plz help
 
Old 12-06-2005, 02:50 AM   #2
blindcoder
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Quote:
Originally Posted by varunbihani
Cmd1: lsof -i : <portnumber> (it will return the process ID)
cmd2: kill -9 <process ID>
Code:
kill `lsof -i :80 | tail -n +2 | sed -e 's,[ \t][ \t]*, ,g' | cut -f2 -d' '`
You don't really want to kill -9 immediately. Give the program a chance to shut down cleanly.

Quote:
Originally Posted by varunbihani
plz help
Oh, and most people prefer the english word "please", thank you very much.

Greetings,
Benjamin
 
Old 12-06-2005, 02:52 AM   #3
varunbihani
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thanks but explain

Thanks A lot for the script.. Can you also explain this command??
 
Old 12-06-2005, 03:10 AM   #4
blindcoder
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Quote:
Originally Posted by blindcoder
Code:
kill `lsof -i :80 | tail -n +2 | sed -e 's,[ \t][ \t]*, ,g' | cut -f2 -d' '`
Everything between two backticks (`) will be replaced by the output of the command between them.
In this case, this will be executed first:
Code:
lsof -i :80 | tail -n +2 | sed -e 's,[ \t][ \t]*, ,g' | cut -f2 -d' '
So first "lsof -i :80" will be run. Its output will be piped to tail -n +2 which cuts off the first line, which we don't need. The rest will be piped to sed which in this case will truncate all spaces/tabs to one space only for easier parsing. This text is then piped to cut which in this case will print only the second column delimited by a single space (which we created using sed a step earlier). The output will then be all the PIDs without the rest.
Since all this happens within backticks (`) the output from cut will then be inserted in the first command which will then look like this (for example):
Code:
kill 12435 8923 21349
Greetings,
Benjamin.
 
Old 12-06-2005, 03:12 AM   #5
Emmanuel_uk
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man lsof
man sed
man tail
man cut
google linux pipe
Then if you have a question I am sure people will help further
 
Old 12-06-2005, 03:17 AM   #6
blindcoder
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Quote:
Originally Posted by Emmanuel_uk
man lsof
man sed
man tail
man cut
google linux pipe
Then if you have a question I am sure people will help further
*sigh* there goes the oh-so-helpful linux community down the drain...
Posts like yours are the reason why I often hear statements along these lines:
The Linux community isn't helpful at all!
All they tell you is to use google! I can tell that myself.

And others like that. Please, if you don't have anything productive to say, just shut the fuck up, thanks.

Benjamin
 
Old 12-06-2005, 03:20 AM   #7
Emmanuel_uk
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not meant to be offensive. Just see my other 500 posts.
Was going to help if question was clearer
Also missed your answer when I posted
By posting I registered on that thread
Do not be so assuming, and mind your language
 
Old 12-06-2005, 03:24 AM   #8
blindcoder
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whoo, you have more posts than me, I bow before you.
I fail to see where the question was unclear, but maybe that's just me.

Greetings,
Benjamin
 
Old 12-06-2005, 03:35 AM   #9
Emmanuel_uk
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Listen, I have jsut made an appology, you could just please do the same.
No need to be sarcky ok?
If you had checked my posts to see what kind of help I give, you
would not have posted what you just did.

>>Can you also explain this command??
Was not sure what the guy did not understand and where he needed help

Also I explained that I did not see your post. I know I am daft

Ok, peace
 
Old 12-06-2005, 03:35 AM   #10
Emmanuel_uk
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[double posted same text happy clicking problem] deleted

Last edited by Emmanuel_uk; 12-06-2005 at 03:36 AM.
 
Old 12-06-2005, 04:50 AM   #11
blindcoder
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Sorry for it all, but I really get sick at "use google to find out" posts because I keep seeing them literally everywhere I go. So called "help" channels on IRC, mailing lists, newsgroups, everywhere.

I'm sorry to have it taken out on you.

Greetings,
Benjamin
 
Old 12-06-2005, 08:57 AM   #12
Emmanuel_uk
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Thanks. I know, sorry here as well. I was wondering when I was posting about my googling advice being "sane", but I had posted quite a few hints/help to people already, and was running out of steam.
Sometimes script questions are from students, so I tend to want to know what is unclear or expect some homework first.
plz is a good indication of studenthood / younger people. I do not say we have one here, though.

At the same time you had given a great one liner answer
for a *not* such a simple question (IMHO) where one would have expected whoever posted the question to be able to understand / search to understand, not fishing for information / help in that way

Anyhow, I am waffling. This is on top of what I wrote before.

I know googling is not always a suitable message.
Maybe you are kinder, and I am more cynical ?

Nevermind, this is all settled. You know where I come from, and I understand your googlite frustration with non helpful comments
 
Old 12-06-2005, 09:41 AM   #13
dbogdan
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Quote:
Originally Posted by blindcoder
Everything between two backticks (`) will be replaced by the output of the command between them.
In this case, this will be executed first:
Code:
lsof -i :80 | tail -n +2 | sed -e 's,[ \t][ \t]*, ,g' | cut -f2 -d' '
So first "lsof -i :80" will be run. Its output will be piped to tail -n +2 which cuts off the first line, which we don't need. The rest will be piped to sed which in this case will truncate all spaces/tabs to one space only for easier parsing. This text is then piped to cut which in this case will print only the second column delimited by a single space (which we created using sed a step earlier). The output will then be all the PIDs without the rest.
Since all this happens within backticks (`) the output from cut will then be inserted in the first command which will then look like this (for example):
Code:
kill 12435 8923 21349
Greetings,
Benjamin.

Wow! Now that is a truely helpful post. I've been looking to do something similar to this but was kinda stumped... this detailed breakdown made a little light in my head go BING!... and saved me potentially hours of time searching Google and man pages.

Dave
 
Old 12-06-2005, 09:46 AM   #14
Emmanuel_uk
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something good out of this discussion then
the one liner gets real credit, which is due
 
  


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