[ILUG] Truncating a binary file from the command-line

[Kieran.Tully AT acm.org]

Is there a simple way to truncate a file to a given length from the
command-line?

Or, more particularly, given a binary file "records" of size 5104 bytes, 
is there a one-liner to destructively truncate it to the closest multiple 
of 10 bytes, discarding the extra 4 bytes?


I'm thinking "dd" could do it but I don't want the overhead of
copying the file.

I'm aware of truncate(2) so I may just call it with perl -e.

This is on RedHat 9 if it makes a difference.

Thanks,
-- 
Kieran Tully, Software Developer and Tenor
Reply to Kieran.Tully AT acm.org
http://kieran.tul.ly  http://www.cs.tcd.ie/~tullyka