If not for that, you wouldn't need the shell. You need the shell=True so that the wildcard in *.log will be interpreted. It will look something like this: proc = subprocess.Popen(, stdout=subprocess.PIPE, shell=True) Subprocess.check_output will wait until the child process terminates and only then give you it's output.

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Return a different column of the dataframe if there is a grep match between two vectors.Find correlation between columns whose names are specified as values in another dataframe.