How to find a unix process in Python

Question

I would to find if the output of 'ps' command contain the process 'smtpd' The problem is that various busybox need different ps command! some need ' ps x ', other need ' ps w ' and other only the ' ps '

How i can make a universal algorithm that try all 'ps' possibilities ?

Example:

linex=''
foo=os.popen('ps')
for x in foo.readlines():
   if x.lower().find('smtpd') != -1:
     // SOME SCRIPT STUFF on linex string...
return linex

linex=''
foo=os.popen('ps w')
for x in foo.readlines():
   if x.lower().find('smtpd') != -1:
     // SOME SCRIPT STUFF on linex string...
return linex

linex=''
foo=os.popen('ps x')
for x in foo.readlines():
   if x.lower().find('smtpd') != -1:
     // SOME SCRIPT STUFF on linex string...
return linex

Do you really need this? Any POSIX-compatible ps shouldn't be truncating lines unless writing to a TTY. Also, I can't believe different busybox versions have radically different versions of ps (are you sure you don't have a real separate ps command on some machines instead of a busybox builtin?) Plus, if you use the standard (--prefixed) flags instead of trying to use the GNU or BSD extensions, ps -ww should work on any ps—GNU, BSD, or otherwise. — abarnert
– abarnert, Commented Sep 13, 2014 at 0:34

Community · Accepted Answer · 2017-05-23 12:24:14Z

1

Check this:

Process list on Linux via Python

/proc is the right place for you to find what you want

import os

pids = [pid for pid in os.listdir('/proc') if pid.isdigit()]

for pid in pids:
    try:
        cmd = open(os.path.join('/proc', pid, 'cmdline'), 'rb').read()
        if cmd.find('smtpd') != -1:
            print "PID: %s; Command: %s" % (pid, cmd)
    # process has already terminated
    except IOError:
        continue

edited May 23, 2017 at 12:24

CommunityBot

11 silver badge

answered Sep 12, 2014 at 23:37

Patrick Shan

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Comments

Joran Beasley · Accepted Answer · 2014-09-12 23:32:05Z

0

def find_sys_cmds(needle,cmd,options):
    for opt in options:
        for line in os.popen("%s %s"%(cmd,opt)).readlines():
            if needle in line.lower():
                return line

print find_sys_cmds("smtpd","ps",["","x","w","aux",..."])

is one way you might do this

if you might have multiple matching processes

def find_sys_cmds(needle,cmd,options):
     for opt in options:
         for line in os.popen("%s %s"%(cmd,opt)).readlines():
             if needle in line.lower():
                    yield line

for line in find_sys_cmds("smtpd","ps",["","x","w","aux",..."]):
    print line

answered Sep 12, 2014 at 23:32

Joran Beasley

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