On Wed, Nov 07, 2018 at 10:22:00AM +0100, srinivasan wrote: > Could you please help me as it seems to be like grep and cut commands are > not working in the above line ie., on *cmd = "blkid -o export %s | grep > \'TYPE\' | cut -d\"=\" -f3" % fs*?
Then get them working first. What happens when you execute that line directly on the command line? But I have to wonder, are you being paid by the hour? Because it seems like a waste of time and effort to be using a pipeline of commands for this. You seem to be deliberately turning a small, easy job into a huge, difficult job. The *easiest* way to do this is to do the string processing in Python, not using the hard-to-use shell commands. Python has its own grep module: import grep but since all you are doing is looking for a plain string with no wildcards, you don't even need that. Collect the output of blkid into a string, then do your processing in Python: # Untested for line in output.splitlines(): # each line looks something like this # "/dev/md0: UUID="3cb91a07-14c9-4ae4-81e1-6eb662eabeee" TYPE="ext3" p = line.find('TYPE="') if p == -1: continue # skip the line result = line[p:] if line.endswith('"'): result = result[:-1] print("Found file type", result) Much easier to read and write and debug than a pipeline of Unix command line tools, and likely to be faster too. -- Steve _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor