Re: Piping and Redirection

Dennis Lovelady wrote:

For the record, OVRDBF ... TOFILE(...) is precisely what redirection is
about.

But it stops there, unfortunately.

Piping is the ability to stream the output one process as the input of
another.  On the AS/400 (ignoring QSH if I may be so bold), this simple
example:
    sed 's/a/b/g' filename | grep 'any' | tee def | more

would be executed something like this (assuming that sed and grep and tee
actually exist)   :

ovrdbf input TOFILE(filename)
ovrdbf output TOFILE(qtemp/stream1)
call sed 's/a/b/g'
ovrdbf input TOFILE(qtemp/stream1)
ovrdbf output TOFILE(qtemp/stream2)
call grep 'any'
ovrdbf input TOFILE(qtemp/stream2)
ovrdbf output TOFILE(def)
call tee
/* (existing overrides will suffice here...) */
call more

Kinda loses the beauty and simplicity.

Dennis

Just another difference: In Unix, the commands can run in separate
processes running simultaneously. And so that OS/400 command
sequence isn't quite the same.

Cheers!  Hans