> On 20 Oct 2019, at 19.33, Bernhard Voelker <m...@bernhard-voelker.de> wrote: > > On 2018-11-25 17:45, furrymc...@lippydanger.jumpingcrab.com wrote: >> Please consider a self join from stdin in coreutils. >> >> $ seq 3 | join -j2 - - | paste -s >> 1 1 1 2 1 3 2 1 2 2 2 3 3 1 3 2 3 3 > > What about tee'ing into a 'fifo' which is read again by join? > > $ mkfifo fifo \ > && seq 3 | tee fifo | join -j2 - fifo | paste -s \ > && rm fifo > 1 1 1 2 1 3 2 1 2 2 2 3 3 1 3 2 3 3 > > Have a nice day, > Berny >
This will hang if the lines get so long that the fifo is filled before it can be emptied, e.g. this hangs on my machine: mkfifo fifo && seq -s , 20000 | tee fifo | join -j2 - fifo | paste -s && rm fifo Best, Rasmus
