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The
function hands the argument to the command interpreter The calling process
waits for the shell to finish executing the command, ignoring and and
blocking If is a pointer, will return non-zero. Otherwise, returns
the termination status of the shell in the format specified by
If a child process cannot be created, or the termination status of
the shell cannot be obtained, returns -1 and sets to indicate the error.
If execution of the shell fails, returns the termination status for a
program that terminates with a call of
The function
conforms to and
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