Bishop, Peter wrote:
Hi again,
I'm moving ahead a little bit and have done some basic tests with tapes but now
have something I don't understand.
I'm trying to "concatenate" two tapes into one named pipe, and then read the
pipe, hoping thereby to read the two tapes at once (trying to emulate the z/OS JCL
concatenation concept).
Here's my logic, which is not working as I'll explain in a minute. My thinking
is that I can write to the pipe sequentially and read it sequentially, but it
appears not to work that way.
pe...@sydvs002:~> sudo dd if=/dev/rtibm0 of=pipe &
pe...@sydvs002:~> sudo dd if=/dev/rtibm1 of=pipe &
pe...@sydvs002:~> sudo dd if=pipe of=packages &
Yuck!
sudo bash -c\
'(sudo dd if=/dev/rtibm0;dd if=/dev/rtibm1 ) | dd of=packages'
You can punctuate it differently:
sudo bash -c\
'(sudo dd if=/dev/rtibm0;dd if=/dev/rtibm1 )' | dd of=packages
and extend it
sudo bash -c\
'(sudo dd if=/dev/rtibm0;dd if=/dev/rtibm1 )' \
| ssh other.example.com dd of=packages
and cat will work as well as dd.
--
Cheers
John
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