Very Computer

by **Davi** » Fri, 25 Nov 2005 16:20:55

Does anybody know what "echo < /dev/rmt/0m" does?

Thanks in advance.

by **Jeroen Bess** » Fri, 25 Nov 2005 17:45:11

> Does anybody know what "echo < /dev/rmt/0m" does?

> Thanks in advance.

My 1st guess would be that it echoes the contents of the tape (and
afterwards rewind it).

--
Best regards,
Jeroen Besse
(to contact me: the nospam address actually exists)

by **John Howell** » Fri, 25 Nov 2005 19:34:26

> > Does anybody know what "echo < /dev/rmt/0m" does?

> > Thanks in advance.

> My 1st guess would be that it echoes the contents of the tape (and
> afterwards rewind it).

Nearly, but not quite. Having assigned the tape to stdin echo will
ignore it, as it always ignored stdin, and produce a blank line, after
which the tape will be rewound when stdin to echo is closed.

John Howells

by **Rainer Beushause** » Fri, 25 Nov 2005 19:44:52

> Does anybody know what "echo < /dev/rmt/0m" does?

> Thanks in advance.

it will spit out a blank line

Rainer

by **Tim Bradsha** » Fri, 25 Nov 2005 21:07:46

> it will spit out a blank line

And rewind the tape, which is probably the intended effect.

I can't see why anyone would do this rather than use mt though:
mt -f /dev/rmt/0m rew
for instance (probably that's the default tape device for mt anyway,
and the rew isn't really needed as it happens by side-effect anyway,
but it is *much* clearer what is going on).

--tim

Very Computer

What does "echo < /dev/rmt/0m" mean?

What does "echo < /dev/rmt/0m" mean?

What does "echo < /dev/rmt/0m" mean?

What does "echo < /dev/rmt/0m" mean?

What does "echo < /dev/rmt/0m" mean?

What does "echo < /dev/rmt/0m" mean?