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myCoolVariable="some_string"
os.system("echo myCoolVariable")
2.
>>> os.system('echo "asdg"')
asdg
0
>>> os.system("echo 'asdgwere'")
asdgwere
0
3.
$ python
>>>hamburger="potato"
>>>import os
>>>os.system("echo 'hamburger'")
potato
0
4.
hamburger=os.system('echo $MY_SHELL_VAR | sed "s/longsed/replacement/g"')
5.
>>> string="python is cool"
>>> cmd="echo "+string
>>> os.system(cmd)
python is cool
0
>>>
6.
bash$ python
Python 2.4.3 (#1, May 18 2006, 07:40:45)
[GCC 3.3.3 (cygwin special)] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from os import system
>>> food = 'spam'
>>> system('echo %(food)s' % locals())
spam
0
>>>


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import os,random,sys,time
while True:
father = os.fork()
if father:
time.sleep(2)
rd = 7
else:
#random.seed()
rd = random.choice([2,3,4,5])
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