On Fri, 5 Feb 2016 03:11:34 -0600, Bill Woodger wrote: > >> ... A DOS partisan once explained his >> misunderstanding of pipes to me that way: >> >> CAT reads /etc/passwd and writes to temporary file TEMP1. >> When CAT terminates, GREP reads TEMP1 and writes TEMP2 >> When GREP terminates, AWK reads TEMP2 and writes to stdout. > >MS-DOS/PC-DOS didn't have true pipes, and the "piping" provided was exactly as >your DOS partisan described (writing to a temporary dataset, first process >completes before second starts, reading the temporary file, etc). Command >using piping "looked like" it may look in a Unix, but didn't operate the Unix >way. > My DOS colleague's "misunderstanding" was that he expected UNIX pipes to be implemented in a similar way.
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