Is there any way I can get the PID by process name in Python?
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3110 meysam 20 0 971m 286m 63m S 14.0 7.9 14:24.50 chrome
For example I need to get 3110
by chrome
.
This question is related to
python
linux
python-2.7
pid
For posix (Linux, BSD, etc... only need /proc directory to be mounted) it's easier to work with os files in /proc. It's pure python, no need to call shell programs outside.
Works on python 2 and 3 ( The only difference (2to3) is the Exception tree, therefore the "except Exception", which I dislike but kept to maintain compatibility. Also could've created a custom exception.)
#!/usr/bin/env python
import os
import sys
for dirname in os.listdir('/proc'):
if dirname == 'curproc':
continue
try:
with open('/proc/{}/cmdline'.format(dirname), mode='rb') as fd:
content = fd.read().decode().split('\x00')
except Exception:
continue
for i in sys.argv[1:]:
if i in content[0]:
print('{0:<12} : {1}'.format(dirname, ' '.join(content)))
Sample Output (it works like pgrep):
phoemur ~/python $ ./pgrep.py bash
1487 : -bash
1779 : /bin/bash
you can also use pgrep
, in prgep
you can also give pattern for match
import subprocess
child = subprocess.Popen(['pgrep','program_name'], stdout=subprocess.PIPE, shell=True)
result = child.communicate()[0]
you can also use awk
with ps like this
ps aux | awk '/name/{print $2}'
You can use psutil
package:
Install
pip install psutil
Usage:
import psutil
process_name = "chrome"
pid = None
for proc in psutil.process_iter():
if process_name in proc.name():
pid = proc.pid
If your OS is Unix base use this code:
import os
def check_process(name):
output = []
cmd = "ps -aef | grep -i '%s' | grep -v 'grep' | awk '{ print $2 }' > /tmp/out"
os.system(cmd % name)
with open('/tmp/out', 'r') as f:
line = f.readline()
while line:
output.append(line.strip())
line = f.readline()
if line.strip():
output.append(line.strip())
return output
Then call it and pass it a process name to get all PIDs.
>>> check_process('firefox')
['499', '621', '623', '630', '11733']
Complete example based on the excellent @Hackaholic's answer:
def get_process_id(name):
"""Return process ids found by (partial) name or regex.
>>> get_process_id('kthreadd')
[2]
>>> get_process_id('watchdog')
[10, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61] # ymmv
>>> get_process_id('non-existent process')
[]
"""
child = subprocess.Popen(['pgrep', '-f', name], stdout=subprocess.PIPE, shell=False)
response = child.communicate()[0]
return [int(pid) for pid in response.split()]
Since Python 3.5, subprocess.run() is recommended over subprocess.check_output():
>>> int(subprocess.run(["pidof", "-s", "your_process"], stdout=subprocess.PIPE).stdout)
Also, since Python 3.7, you can use the capture_output=true
parameter to capture stdout and stderr:
>>> int(subprocess.run(["pidof", "-s", "your process"], capture_output=True).stdout)
To improve the Padraic's answer: when check_output
returns a non-zero code, it raises a CalledProcessError. This happens when the process does not exists or is not running.
What I would do to catch this exception is:
#!/usr/bin/python
from subprocess import check_output, CalledProcessError
def getPIDs(process):
try:
pidlist = map(int, check_output(["pidof", process]).split())
except CalledProcessError:
pidlist = []
print 'list of PIDs = ' + ', '.join(str(e) for e in pidlist)
if __name__ == '__main__':
getPIDs("chrome")
The output:
$ python pidproc.py
list of PIDS = 31840, 31841, 41942
Source: Stackoverflow.com