I would greatly appreciate a python solution as this problem is only the head of a larger problem for which I am on a mission to write a FULL one-stop-shop python script. I am trying two things- iter() and fileinput module... Thanks!
________________________________ From: Matty Sarro <msa...@gmail.com> To: Dlanor Slegov <dlanorsle...@rocketmail.com> Sent: Thu, August 12, 2010 5:22:58 PM Subject: Re: Inserting/Deleting newline(s) in very large text files On Thu, Aug 12, 2010 at 11:12 AM, Dlanor Slegov <dlanorsle...@rocketmail.com> wrote: Hi, > >I am dealing with very large text files (a few million lines) and would like >to >check and modify them according to a well defined format. The format >requires ONLY ONE NEWLINE (followed by some sort of text) on top of the file >and >NO NEWLINE in the very end. The input files can be very diverse, such as one >file may have 2 newlines on top and none in the end or other may not have a >newline on top and 5 in the end. > > >The aim is to check these files & introduce JUST ONE NEWLINE in the TOP and NO >NEWLINE in the BOTTOM. > >Any pointers will be appreciated. > >Thanks, >DS. > > >-- >http://mail.python.org/mailman/listinfo/python-list > > If you're using a unix box you may want to look into sed. sed -i.<extensionofbackup> '1i text to be inserted in first line' <filename> For example: sed -i.bak '1i alias bond0 bonding' /etc/modprobe.conf Would back up the original file to the initial filename plus the extension .bak. Then it would insert: alias bond0 bonding into /etc/modprobe.conf Into the 1st line of the file, moving everything else down one line. You can find some info on dealing with newlines here: http://www.grymoire.com/Unix/Sed.html#toc-uh-nl I know you're looking for a python solution, but this may be easier. Just a heads up.
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