topic Re: File copy in Operating System - HP-UX

File copy

Enda martin — Wed, 29 Aug 2001 06:46:08 GMT

is there a command within unix which will allow you to copy a certain % of the file to a new file.

EG : File a --> Copy 65% of a to give File b

Re: File copy

Robin Wakefield — Wed, 29 Aug 2001 06:57:10 GMT

Hi Enda,

I assume you mean text files - which section of the file do you want to copy, e,g, the first 65% or the last 65%?

Rgds, Robin.

Re: File copy

Enda martin — Wed, 29 Aug 2001 07:03:13 GMT

the % of the split is not really important - the original file (file a) is to large to manipulate as is so I just need to split it into two smaller files - so therefore say a 50-50 split

Re: File copy

Rainer von Bongartz — Wed, 29 Aug 2001 07:03:20 GMT

to copy the first xyz bytes from a to b use

head -c -n xyz a > b

to copy the last xyz bytes from a to b use

tail - c xyz a > b

Re: File copy

Rainer von Bongartz — Wed, 29 Aug 2001 07:07:11 GMT

so why not use the split command in this case???

see man split

Regards
Rainer

Re: File copy

Robin Wakefield — Wed, 29 Aug 2001 07:07:49 GMT

Enda,

OK - have a look at the split command - you can tell it how many ways to split, or how big each output file should be.

The problem with tail is that it's not good at handling a large tail of a big file.

Rgds, Robin

Re: File copy

Stefan Schulz — Wed, 29 Aug 2001 07:27:35 GMT

Hi,

there is also th command csplit which allows you to use searchpatterns. So you could use for example a specific date or time in a logfile as the splitposition.

Have a look at man csplit.

Hope this helps.

Regards Stefan

Re: File copy

MANOJ SRIVASTAVA — Wed, 29 Aug 2001 19:18:38 GMT

try split.

Manoj

Re: File copy

harry d brown jr — Thu, 30 Aug 2001 11:37:40 GMT