On Tue, 24 Jun 2003 21:40:24 +1200
Christopher Sawtell <[EMAIL PROTECTED]> wrote:
> On Tue, 24 Jun 2003 20:52, you wrote:
> > On Tue, Jun 24, 2003 at 08:22:13PM +1200, Christopher Sawtell wrote:
> > > [EMAIL PROTECTED] chris $ ./truncate testfile 51
> > > [EMAIL PROTECTED] chris $ ls -l testfi
> It is...and I've just written a C program to call it.
Yes, writing a short wrapper around the C lib function had occured to
me, but I was wondering whether I was ignorant of some shell thing.
Thanks much Tim for doing the work for me :))
Unfortunately, it doesn't work.
off_t length;
On Tue, 24 Jun 2003 20:52, you wrote:
> On Tue, Jun 24, 2003 at 08:22:13PM +1200, Christopher Sawtell wrote:
> > [EMAIL PROTECTED] chris $ ./truncate testfile 51
> > [EMAIL PROTECTED] chris $ ls -l testfile
> > -rw-r--r--1 chrisusers 51 Jun 24 20:17 testfile
> > [EMAIL PROTECTE
On Tue, Jun 24, 2003 at 08:22:13PM +1200, Christopher Sawtell wrote:
> [EMAIL PROTECTED] chris $ ./truncate testfile 51
> [EMAIL PROTECTED] chris $ ls -l testfile
> -rw-r--r--1 chrisusers 51 Jun 24 20:17 testfile
> [EMAIL PROTECTED] chris $ echo $?
> 0
This is the expected beh
On Tue, Jun 24, 2003 at 07:39:43PM +1200, Tim Wright wrote:
> It is...and I've just written a C program to call it.
Or you could skip mucking about with C and use something like Perl.
This way, assuming your Perl supports it, you get largefile support for
free.
$ perl -e 'truncate "/path/to/file
On Tue, 2003-06-24 at 20:22, Nick Rout wrote:
> >
> > cat your_file | tail --bytes=N > /tmp/tempfile ; mv /tmp/tempfile
> > your_file
> >
> > Probably still not quite right.
>
> the man is talking +2G files. that method is likely to take a long time
> and create a lot of time consuming disk acti
On Tue, 24 Jun 2003 20:16:15 +1200
Rob Stockley <[EMAIL PROTECTED]> wrote:
> On Tue, 2003-06-24 at 20:06, Rob Stockley wrote:
> > If it's a text file then how about,
> >
> > cat your_file | tail --bytes=N > your_file
> >
> > where N is the number of bytes to be kept. Can piping be made to
> > op
On Tue, 24 Jun 2003 20:16, you wrote:
> On Tue, 2003-06-24 at 20:06, Rob Stockley wrote:
> > If it's a text file then how about,
> >
> > cat your_file | tail --bytes=N > your_file
> >
> > where N is the number of bytes to be kept. Can piping be made to operate
> > serially using a temporary file? P
On Tue, 2003-06-24 at 20:06, Rob Stockley wrote:
> If it's a text file then how about,
>
> cat your_file | tail --bytes=N > your_file
>
> where N is the number of bytes to be kept. Can piping be made to operate
> serially using a temporary file? Perhaps this is a little dangerous to
> be writing
On Tue, 2003-06-24 at 15:54, Volker Kuhlmann wrote:
> Is there a shell command which can truncate a file to the given number
> of bytes? It would need to work with large files (i.e. >> 2GB).
>
> Thanks,
>
> Volker
If it's a text file then how about,
cat your_file | tail --bytes=N > your_file
w
On Tue, 24 Jun 2003, Rex wrote:
> Christopher Sawtell wrote:
> >
> > man 2 truncate
> >
> > System call, You'll have to write a trivial C program to call the kernel
> > function. Surprisingly, nothing in man(1).
>
> Nope, `tis a function. man 2 truncate.
It is...and I've just written a C program
Christopher Sawtell wrote:
man 2 truncate
System call, You'll have to write a trivial C program to call the kernel
function. Surprisingly, nothing in man(1).
Nope, `tis a function. man 2 truncate.
Rex
On Tue, 24 Jun 2003 17:04, you wrote:
> Thanks, but both split and dd can only copy the first (or more) part(s) of
> a file to a new file. Copying the start of the file is trivial, but
> requires disk space and a lot of time. Truncating it in place is what I'm
> after.
man 2 truncate
System call,
Thanks, but both split and dd can only copy the first (or more) part(s) of a
file to a new file. Copying the start of the file is trivial, but requires
disk space and a lot of time. Truncating it in place is what I'm after.
Thanks,
Volker
--
Volker Kuhlmann is possibly list0570
> Is there a shell command which can truncate a file to the given number
> of bytes? It would need to work with large files (i.e. >> 2GB).
Have a look at "split".
Andre
Check out "man dd", it may be able to do this.
> -Original Message-
> From: Volker Kuhlmann [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, 24 June 2003 3:54 p.m.
> To: [EMAIL PROTECTED]
> Subject: truncate file with shell
>
>
> Is there a shell command which can truncate a file to the
> gi
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