pipe(): input to, and output from, a single process
FWIW if you're on unix, you can use named pipes (fifos) for that:
system("mkfifo my.output")
p = pipe("sed -l s:hello:oops: > my.output", "w")
i = file("my.output", "r", blocking=FALSE, raw=TRUE)
writeLines("hello!\n", p)
flush(p)
readLines(i, 1)
[1] "oops!" Cheers, Simon
On 14/03/2020, at 6:26 AM, Greg Minshall <minshall at umich.edu> wrote: hi. i'd like to instantiate sed(1), send it some input, and retrieve its output, all via pipes (rather than an intermediate file). my sense from pipe and looking at the sources (sys-unix.c) is that is not possible. is that true? are there any thoughts of providing such a facility? cheers, Greg
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