1. Python Execute Unix / Linux Command
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There are two modules in python to excute the linux
commands.
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1. os module
2. subprocess module
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syntax:
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subprocess.call(args, *, stdin=None, stdout=None,
stderr=None, shell=false)

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PASSING ARGUMENTS

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SUBPROCESS.POPEN( ) - STDOUT AND STDERR

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Popen.communicate() interacts with process: Send
data to stdin. Read data from stdout and stderr, until
end-of-file is reached.

10. SHELL VALUE