Delete lines containing a specific word

[Francesco Pietra]

--- Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Sun, 06 Jan 2008 13:33:52 -0800, Francesco Pietra wrote:
> 
> > Steven:
> > Thanks. See below please (of very marginal interest)
> > 
> > --- Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
> > 
> >> On Sun, 06 Jan 2008 09:21:33 -0800, Francesco Pietra wrote:
> >> 
> >> > Please, how to adapt the following script (to delete blank lines) to
> >> > delete lines containing a specific word, or words?
> >> 
> >> That's tricky, because deleting lines from a file isn't a simple
> >> operation. No operating system I know of (Windows, Linux, OS X) has a
> >> "delete line" function.
> > 
> > As I am at Debian Linux, I do that with grep -v
> 
> grep doesn't delete lines. grep matches lines. If you want to delete 
> them, you still have to do the rest of the job yourself.

Well, I use Debian Linux for scientific purposes, so that I have no much time
toget expertise even in the OS. Though, from the command (as user)

grep -v theword thefile.pdb 

I get thefile.pdb without the lines containing "theword".

> 
> 
> >> Secondly, you might want the script to write its output to a file,
> >> instead of printing. So, instead of the line "print line", you want it
> >> to write to a file.
> > 
> > may be cumbersome, though I use  2>&1 | tee output file.pdb so that I
> > can see what happens on the screen and have the modified file.
> 
> Yes, matching lines and sending them to stdout is a better solution than 
> trying to delete them from a file.
> 
> 
> 
> -- 
> Steven
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 



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