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Home -> Community -> Mailing Lists -> Oracle-L -> RE: shell and output redirection
They are Not Run ||'el... The utput of the first program is stored before
the second is executed...
If you want to run in parrallel u need to use Named Pipes.
HTH
Cheers,
Ganesh R
-----Original Message-----
From: Tanel P=F5der [mailto:tanel.poder.003_at_mail.ee]=20
Sent: 02 July 2004 19:51
To: oracle-l_at_freelists.org
Subject: OT: shell and output redirection
Hi!
When I redirect output from program a to program b using a shell pipe, when is the receiving procedure executed?
E.g.:
$ program1 | program2
When program1 outputs let say 3 rows after every millisecond and pipes them to program2, does program2 get executed on every output request? (what if there is a separate write request for every row?). Does program2 execute asynchronously or synchronously right after every write request on STDIO stream? Does program1 pass control over to program2 and return processing only after program2 has completed it's actions?
These are the questions that bury my mind this lovely Friday evening.... Tanel.
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