Remote Network Commands

Jens Hartman shows how to use rlogin, rcp, and rsh to transfer and manipulate data on different computers from across the network.
Problems:

Apart from the fact that some of the above examples probably will not run under some configurations, I have encountered some strange behavior. Consider we have, as in the previous examples, two identical files: bin.tar on banana and bin.tar on orange. Now I try on orange:

ls | grep bin

The response is bin.tar. The same goes for:

rsh banana ls | grep bin

but the next one chokes:

ls | rsh banana grep bin

Piping files into a remote shell with the command dd, though, has never choked.

Conclusion:

With the help of these commands, getting connected to other machines is made considerably easier. The rcp and rlogin commands can be almost fully substituted for commands such as ftp and telnet on your local network. Not only can you access your accounts, you might also allow other trusted users to access your accounts by means of the .rhosts file.

Finally, the rsh command enables you to generate data streams through several different machines, accessing local disk and tape drives (or anything else you are allowed to access).

Jens Hartmann (hartmann@dkrz.d400.de) is a geophysicist at the University of Hamburg, where he uses Linux for his work.

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