topic Re: file transfer in Operating System - HP-UX

file transfer

Rushank — Mon, 13 Aug 2001 21:27:31 GMT

Hello,

We do lots of file transfer with rcp using script. Is there anyway I make sure that the file from source is entirely copied to the destination before I issue another command ??

Thanks

Re: file transfer

James R. Ferguson — Mon, 13 Aug 2001 22:38:35 GMT

Hi:

A file is completely copied when the copy process terminates. That does *not* mean that the copy didn't terminate prematurely, perhaps for a network layer error (loss of connection, etc.) or perhaps because the destination filesystem was full.

Perhaps the best way to verify that the file at the source and the file at the destination *are* in fact, exact copies is to 'cksum' the file at both points. If the checksums are equal, then the copy was successful.

See "man cksum".

...JRF...

Re: file transfer

Dave La Mar — Mon, 13 Aug 2001 22:42:24 GMT

I picked up this hint from the forum so I could verify ftp transfers.

ftp -v maia << endl>> /somedirpath/ftp.log

It works very well for additional scripts to check for success.

I'm new to unix but maybe this will help.
dl

Re: file transfer

Klaus Crusius — Tue, 14 Aug 2001 06:39:07 GMT

Hi,

if you check ten exit code of rcp, you should be quite sure, the transfer completed and the files are identical.

rcp from to
|| { echo >2 "rcp failed"; exit 1; }

Klaus

Re: file transfer

Ravi_8 — Tue, 14 Aug 2001 10:49:38 GMT

Hi,
Once the file has been transfered completely the program will terminate by itself. sometimes it may terminate due to network/ link problems,in this case to confirm the complete transfer look at the size of the file on both the machine or u can use 'cksum' command on both machines.

Re: file transfer

Wodisch — Fri, 17 Aug 2001 19:34:48 GMT

Hello Rushank,

you could create a checksum before doing the transfer
on the original station, then re-calculate it on the
destination station, and then compare the results.
"md5sum" comes to mind (Open Source, simple, fast,
proven)...

HTH,
Wodisch