I'm with Brian on this one. I don't know of a way to truncate a file
without playing with the filesystem.
- Sebastian
On Wed, 28 Jun 2006, Brian Chrisman wrote:
I kind of doubt that there's anything else you can do. I think you'd have to
have some program that manipulates the the filesystem inodes to do what you
want. Generally you are limited to the system call interface like 'open',
'read', 'write', 'truncate'.. and all that stuff.
You could certainly write null characters over the first 300 lines, but if
that doesn't do what you want, I'm not certain what else will, barring some
sort of hacky work with a filesystem debugger tool.
You could also have some part of your program which maintains a current
offset into the file, and automatically does a 'seek' to that position when
you next run it... it'd be a dirty hack, but it might be what you want. Then
you'd have to write your code in some full programming language, not sed.
-Brian
Grant Kelly wrote:
Alright unix fans, who can answer this the best?
I have a text file, it's about 2.3 GB. I need to delete the first 300
lines, and I don't want to have to load the entire thing into an
editor.
I'm trying `sed '1,300d' inputfile > output file` but it's taking a
long time (and space) to output everything to the new file.
There has got to be a better way, a way that can do this in-place...
Grant
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