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Old 02-23-2005, 08:46 AM   #1
dangerousdave
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Using grep, etc to modify a text file


OK, heres the situation. I have my mp3s on an ntfs (read only) drive. I copied the m3u playlist to my linux drive so I can edit it. Aside from replacing all '\' with '/' I need to now point the files in the playlist to the directory on the ntfs drive (as the mp3s are no longer local)

E.g. A line that says "Natalie Imbruglia - Torn (MTV's Live And Loud).mp3" has to be changed to "/mnt/windows/shared/music/mp3/Natalie Imbruglia - Torn (MTV's Live And Loud).mp3".

There are lines beginning with a '#' that I need to ignore (alternate lines with # and file name).

I managed to get all lines from the file that dont begin with '#' by using grep -v '#' best7_linux.m3u. But now I'm stuck... how do I add /mnt/windows..etc to the front of each line then put that back into the file (or into a new one)?

I really dont want to have to create a new playlist, since the songs I listen to are a fraction of what I have in my mp3 directory... I dont want to add them all and have to sift through 1000's deleting ones I dont want to listen to.

I'm pretty sure you can do this through linux shell, or at least through a script. If anyone can post the commands or a link to a decent tutorial that would be brilliant.

Cheers.
 
Old 02-23-2005, 08:56 AM   #2
uman
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http://archive.ncsa.uiuc.edu/General...ing/PerlIntro/

Perl is the best tool for the job, in case you didn't know it's a scripting language well suited for text processing.


Cheers, and good luck!
 
Old 02-23-2005, 08:57 AM   #3
ranelson
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Got AWK?

man awk

If that does not help get an awk book.
 
Old 02-23-2005, 09:58 AM   #4
Blinker_Fluid
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So if I got this right you want to change:
Natalie Imbruglia - Torn (MTV's Live And Loud).mp3
TO:
/mnt/windows/shared/music/mp3/Natalie Imbruglia - Torn (MTV's Live And Loud).mp3


You could do this with sed doing something like:
sed 's/^/\/mnt\/windows\/shared\/music\/mp3\//g' mp3_list
(mp3_list is the name of the file where I saved the list)
 
Old 02-23-2005, 01:10 PM   #5
osat3ch
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i'd use find and replace

IF all the files are in the same folder I would find and replace

first I would find and replace " with "/mnt/windows/shared/music/mp3/
and then I would find and replace .mp3"/mnt/windows/shared/music/mp3/ with .mp3"


hope this helps
 
Old 02-23-2005, 01:33 PM   #6
dangerousdave
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Wow, cheers for all the replies on this one.

In the end I downloaded java and wrote my own little program to do it... stick to what you know, eh. I am right now looking through those commands though, will be useful for future reference. Cheers again.
 
Old 02-23-2005, 02:02 PM   #7
iGoo
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awk, grep (and many forms of grep) and sed are all great text editing tools

personaly i find grep and awk the most useful, sed is out ther in my books :s
 
Old 02-23-2005, 02:49 PM   #8
Blinker_Fluid
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Quote:
Originally posted by iGoo
awk, grep (and many forms of grep) and sed are all great text editing tools

personaly i find grep and awk the most useful, sed is out ther in my books :s
I got used to sed and grep and awk is one of those I have to think about and check my notes on.
 
  


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