rcp or cp on same machine, any difference

[makp]

Hi,

Is there any difference if I use rcp instead of cp on same machine for copying large files?

Apreicate if someone can throw some lights.

Thanks

[Rajeev Shukla]

cp is more prefered on the same system (localhost) coz rcp goes through al the authentication checks and would happen over the NIC where as cp is internal.
In short rcp will take a bit longer compared to cp in localhost

[Gokul Chandola]

Hi,

There are many differences within these two methods, hint is following.

*)The NFS CP will bring the source file into the buffer cache, _and_ will have the destination file in the buffer cache. The rcp will only bring the source file into the buffer cache.

*) rcp is over TCP

Regards,
Gokul Chandola

[SKR_1]

rcp is used for remote copy from another server to server in which you are logged in or vice versa.

Thanks

SKR

[Sajjad Sahir]

rcp means remote copy
cp means copying

rcp is mainly using to copy from system to anohter

while cp is using internal in system


thanks and regards

Sajjad Sahir

[Steven E. Protter]

Shalom,

rcp between machines

cp within one system.

cp is a bit more reliable.

rcp won't copy properly to the same system. Why would you use it to run a local copy through the system NIC card?

SEP

[Pete Randall]

Why not start by looking at the man page:

rcp(1) rcp(1)

NAME
rcp - remote file copyDESCRIPTION
The rcp command copies files, directory subtrees, or a combination of files and directory subtrees from one or more systems to another.


After reading that, I wouldn't even think to use it within one system. I mean, "why"????


Pete

[Laurent Menase]

If you mean
between
rcp
cp from or to NFS

Then rcp is usually better as it sends directly the file from buffercache to the socket.

cp will cause a copy from buffercache to user space, hen from userspace to buffercache, then from buffercache over NFS to the remote system, then to disk