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(def [stdin-r stdin-w] (os/pipe)) (def [stdout-r stdout-w] (os/pipe)) # write the input that will be sent to sed (:write stdin-w "hello world 1\nhello world 2") (:close stdin-w) (os/execute @("sed" "s|world|janet|g") :px # the program reads from :in and writes to :out {:in stdin-r :out stdout-w}) (:read stdout-r math/int32-max) # => @"hello janet 1\nhello janet 2" # feed two lines to sed, which replaces "world" # with "janet", and read the modified results back