uname_result(system='Linux', node='fedora.echorand',
release='3.7.4-204.fc18.x86_64', version='#1 SMP Wed Jan 23 16:44:29
UTC 2013', machine='x86_64', processor='x86_64')

>>> platform.release()
'3.7.4-204.fc18.x86_64'

from __future__ import print_function

with open('/proc/cpuinfo') as f:
    for line in f:
        print(line.rstrip('\n'))

""" Print the model of your
    processing units

"""

from __future__ import print_function

with open('/proc/cpuinfo') as f:
    for line in f:
        # Ignore the blank line separating the information between
        # details about two processing units
        if line.strip():
            if line.rstrip('\n').startswith('model name'):
                model_name = line.rstrip('\n').split(':')[1]
                print(model_name)

""" Find the real bit architecture
"""

from __future__ import print_function

with open('/proc/cpuinfo') as f:
    for line in f:
        # Ignore the blank line separating the information between
        # details about two processing units
        if line.strip():
            if line.rstrip('\n').startswith('flags') \
                    or line.rstrip('\n').startswith('Features'):
                if 'lm' in line.rstrip('\n').split():
                    print('64-bit')
                else:
                    print('32-bit')

"""
/proc/cpuinfo as a Python dict
"""
from __future__ import print_function
from collections import OrderedDict
import pprint

def cpuinfo():
    ''' Return the information in /proc/cpuinfo
    as a dictionary in the following format:
    cpu_info['proc0']={...}
    cpu_info['proc1']={...}

    '''

    cpuinfo=OrderedDict()
    procinfo=OrderedDict()

    nprocs = 0
    with open('/proc/cpuinfo') as f:
        for line in f:
            if not line.strip():
                # end of one processor
                cpuinfo['proc%s' % nprocs] = procinfo
                nprocs=nprocs+1
                # Reset
                procinfo=OrderedDict()
            else:
                if len(line.split(':')) == 2:
                    procinfo[line.split(':')[0].strip()] = line.split(':')[1].strip()
                else:
                    procinfo[line.split(':')[0].strip()] = ''
           
    return cpuinfo

if __name__=='__main__':
    cpuinfo = cpuinfo()
    for processor in cpuinfo.keys():
        print(cpuinfo[processor]['model name'])

from __future__ import print_function
from collections import OrderedDict

def meminfo():
    ''' Return the information in /proc/meminfo
    as a dictionary '''
    meminfo=OrderedDict()

    with open('/proc/meminfo') as f:
        for line in f:
            meminfo[line.split(':')[0]] = line.split(':')[1].strip()
    return meminfo

if __name__=='__main__':
    #print(meminfo())
   
    meminfo = meminfo()
    print('Total memory: {0}'.format(meminfo['MemTotal']))
    print('Free memory: {0}'.format(meminfo['MemFree']))

def netdevs():
    ''' RX and TX bytes for each of the network devices '''

    with open('/proc/net/dev') as f:
        net_dump = f.readlines()
   
    device_data={}
    data = namedtuple('data',['rx','tx'])
    for line in net_dump[2:]:
        line = line.split(':')
        if line[0].strip() != 'lo':
            device_data[line[0].strip()] = data(float(line[1].split()[0])/(1024.0*1024.0),
                                                float(line[1].split()[8])/(1024.0*1024.0))
   
    return device_data

if __name__=='__main__':
   
    netdevs = netdevs()
    for dev in netdevs.keys():
        print('{0}: {1} MiB {2} MiB'.format(dev, netdevs[dev].rx, netdevs[dev].tx))

from __future__ import print_function
import os
def process_list():

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

    return pids

if __name__=='__main__':

    pids = process_list()
    print('Total number of running processes:: {0}'.format(len(pids)))

"""
Read block device data from sysfs
"""

from __future__ import print_function
import glob
import re
import os

# Add any other device pattern to read from
dev_pattern = ['sd.*','mmcblk*']

def size(device):
    nr_sectors = open(device+'/size').read().rstrip('\n')
    sect_size = open(device+'/queue/hw_sector_size').read().rstrip('\n')

    # The sect_size is in bytes, so we convert it to GiB and then send it back
    return (float(nr_sectors)*float(sect_size))/(1024.0*1024.0*1024.0)

def detect_devs():
    for device in glob.glob('/sys/block/*'):
        for pattern in dev_pattern:
            if re.compile(pattern).match(os.path.basename(device)):
                print('Device:: {0}, Size:: {1} GiB'.format(device, size(device)))

if __name__=='__main__':
    detect_devs()

"""
Print all the users and their login shells
"""

from __future__ import print_function
import pwd

# Get the users from /etc/passwd
def getusers():
    users = pwd.getpwall()
    for user in users:
        print('{0}:{1}'.format(user.pw_name, user.pw_shell))

if __name__=='__main__':
    getusers()

"""
Utility to play around with users and passwords on a Linux system
"""

from __future__ import print_function
import pwd
import argparse
import os

def read_login_defs():

    uid_min = None
    uid_max = None

    if os.path.exists('/etc/login.defs'):
        with open('/etc/login.defs') as f:
            login_data = f.readlines()
           
        for line in login_data:
            if line.startswith('UID_MIN'):
                uid_min = int(line.split()[1].strip())
           
            if line.startswith('UID_MAX'):
                uid_max = int(line.split()[1].strip())

    return uid_min, uid_max

# Get the users from /etc/passwd
def getusers(no_system=False):

    uid_min, uid_max = read_login_defs()

    if uid_min is None:
        uid_min = 1000
    if uid_max is None:
        uid_max = 60000

    users = pwd.getpwall()
    for user in users:
        if no_system:
            if user.pw_uid >= uid_min and user.pw_uid <= uid_max:
                print('{0}:{1}'.format(user.pw_name, user.pw_shell))
        else:
            print('{0}:{1}'.format(user.pw_name, user.pw_shell))

if __name__=='__main__':

    parser = argparse.ArgumentParser(description='User/Password Utility')

    parser.add_argument('--no-system', action='store_true',dest='no_system',
                        default = False, help='Specify to omit system users')

    args = parser.parse_args()
    getusers(args.no_system)

User/Password Utility

optional arguments:
  -h, --help   show this help message and exit
  --no-system  Specify to omit system users

def netdevs(iface=None):
    ''' RX and TX bytes for each of the network devices '''

    with open('/proc/net/dev') as f:
        net_dump = f.readlines()
   
    device_data={}
    data = namedtuple('data',['rx','tx'])
    for line in net_dump[2:]:
        line = line.split(':')
        if not iface:
            if line[0].strip() != 'lo':
                device_data[line[0].strip()] = data(float(line[1].split()[0])/(1024.0*1024.0),
                                                    float(line[1].split()[8])/(1024.0*1024.0))
        else:
            if line[0].strip() == iface:
                device_data[line[0].strip()] = data(float(line[1].split()[0])/(1024.0*1024.0),
                                                    float(line[1].split()[8])/(1024.0*1024.0))   
    return device_data

if __name__=='__main__':

    parser = argparse.ArgumentParser(description='Network Interface Usage Monitor')
    parser.add_argument('-i','--interface', dest='iface',
                        help='Network interface')

    args = parser.parse_args()

    netdevs = netdevs(iface = args.iface)
    for dev in netdevs.keys():
        print('{0}: {1} MiB {2} MiB'.format(dev, netdevs[dev].rx, netdevs[dev].tx))

em1: 0.0 MiB 0.0 MiB
wlan0: 146.099492073 MiB 12.9737148285 MiB
virbr1: 0.0 MiB 0.0 MiB
virbr1-nic: 0.0 MiB 0.0 MiB

$ ./net_devs_2.py  --help
usage: net_devs_2.py [-h] [-i IFACE]

Network Interface Usage Monitor

optional arguments:
  -h, --help            show this help message and exit
  -i IFACE, --interface IFACE
                        Network interface

$ ./net_devs_2.py  -i wlan0
wlan0: 146.100307465 MiB 12.9777050018 MiB