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s-Execute shell commands via os.popen() and return status, output.

Interface summary:

       import commands

       outtext = commands.getoutput(cmd)
       (exitstatus, outtext) = commands.getstatusoutput(cmd)
       outtext = commands.getstatus(file)  # returns output of "ls -ld file"

A trailing newline is removed from the output string.

Encapsulates the basic operation:

      pipe = os.popen('{ ' + cmd + '; } 2>&1', 'r')
      text = pipe.read()
      sts = pipe.close()

 [Note:  it would be nice to add functions to interpret the exit status.]
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