Return value of x os system

Question

When I type os system  whoami   in Python  as root  it returns root  but when I try to assign it to a variable x   os system  whoami   it set s the value of x to 0  Why

User · Answer

os system  command   returns a 16 bit number  which first 8 bits from left lsb  talks about signal used by os to close the command  Next 8 bits talks about return code of command    Refer my answer for more detail in What is the return value of os system   in Python

User · Answer

os system   returns the  encoded  process exit value  0 means success      On Unix  the return value is the exit status of the process encoded in the format specified for wait    Note that POSIX does not specify the meaning of the return value of the C system   function  so the return value of the Python function is system-dependent    The output you see is written to stdout  so your console or terminal  and not returned to the Python caller   If you wanted to capture stdout  use subprocess check output   instead   x   subprocess check output   whoami

[python] Return value of x = os.system(..)

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