Processes in Linux from Python

[Johny]

To get a number of the http processes running on my Linux( Debia box)
I use
ps -ef | grep "[h]ttpd" | wc -l

But If I want to use to get a number of the http processes from my
Python program I must use a popen command e.g.
popen2.popen3('ps -ef | grep "[h]ttpd" | wc -l')
that is I must call an external command from Python.

But it creates a zombie.
So my question is:
Is it possible to get a number of the http processes running on Linux
directly from Python ?

Thanks for help.
L.

 

[Diez B. Roggisch]

To get a number of the http processes running on my Linux( Debia box)
I use
ps -ef | grep "[h]ttpd" | wc -l

But If I want to use to get a number of the http processes from my
Python program I must use a popen command e.g.
popen2.popen3('ps -ef | grep "[h]ttpd" | wc -l')
that is I must call an external command from Python.

The shell does the exact same thing. And by the way: i think you miss a

grep -v grep

after the first grep - otherwise you count the grep itself.

But it creates a zombie.

Try using the subprocess module. It should not require you to call wait
yourself.

So my question is:
Is it possible to get a number of the http processes running on Linux
directly from Python ?

Not really, or at least not with less effort & without duplicating
system tools functionality.

Diez

 

[Derek Martin]

To get a number of the http processes running on my Linux( Debia box)
I use
ps -ef | grep "[h]ttpd" | wc -l

[...]
The shell does the exact same thing. And by the way: i think you miss a

grep -v grep

Indeed not. The brackets around the 'h' (which make it a character
class, or range if you prefer) prevent the regex from matching itself.

--
Derek D. Martin
http://www.pizzashack.org/
GPG Key ID: 0x81CFE75D


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