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Two named PIPEs (PIPE_in/PIPE_out) connected with `tail -f` | String sent to PIPE_in doesn't reach PIPE_out
The 2019 Stack Overflow Developer Survey Results Are InProblem with pipes. Pipe terminates when reader doneWhat are the difference between those four commands (fifo, process substitution, redirection…)Tailing log files in two different hostsNamed pipes: several experiments leads to confusionHow to forward between processes with named pipes?Unbuffered socat command to connect serial ports in remote machines and log the dataWrite to stdin of running process on occasionProvide Data Via Named PipeBroken pipes! Problem with using named pipes to link together 2 standalone programsgrep --exclude option doesn't always skip named pipes
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
1.Create named PIPEs, pipe_in and pipe_out by running:
$ mkfifo pipe_in
$ mkfifo pipe_out
2.Connect pipe_in to pipe_out:
TERM0: $ tail -f pipe_in > pipe_out
3.Send string hello world! to pipe_in and expect it to arrive at pipe_out:
TERM1: $ tail -f pipe_out
TERM2: $ echo "hello world!" > pipe_in
I can only see the string arriving at pipe_out if I kill command in 2..
It seems to be a buffering issue so I decided to run all commands above with stdbuf -i0 -e0 -o0 <command> but it didn't work.
pipe fifo mkfifo
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
asked Mar 11 at 16:27
fmagnofmagno
82
add a comment |
1.Create named PIPEs, pipe_in and pipe_out by running:
$ mkfifo pipe_in
$ mkfifo pipe_out
2.Connect pipe_in to pipe_out:
TERM0: $ tail -f pipe_in > pipe_out
3.Send string hello world! to pipe_in and expect it to arrive at pipe_out:
TERM1: $ tail -f pipe_out
TERM2: $ echo "hello world!" > pipe_in
I can only see the string arriving at pipe_out if I kill command in 2..
It seems to be a buffering issue so I decided to run all commands above with stdbuf -i0 -e0 -o0 <command> but it didn't work.
pipe fifo mkfifo
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
asked Mar 11 at 16:27
fmagnofmagno
82
1
Good point, @Jeff Schaller. I have just deleted that question. I find this one, here, more fundamental. As soon as I solve this one I will likely be able to solve the other one too.
– fmagno
Mar 11 at 16:41
add a comment |
1.Create named PIPEs, pipe_in and pipe_out by running:
$ mkfifo pipe_in
$ mkfifo pipe_out
2.Connect pipe_in to pipe_out:
TERM0: $ tail -f pipe_in > pipe_out
3.Send string hello world! to pipe_in and expect it to arrive at pipe_out:
TERM1: $ tail -f pipe_out
TERM2: $ echo "hello world!" > pipe_in
I can only see the string arriving at pipe_out if I kill command in 2..
It seems to be a buffering issue so I decided to run all commands above with stdbuf -i0 -e0 -o0 <command> but it didn't work.
pipe fifo mkfifo
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
asked Mar 11 at 16:27
fmagnofmagno
82
1.Create named PIPEs, pipe_in and pipe_out by running:
$ mkfifo pipe_in
$ mkfifo pipe_out
2.Connect pipe_in to pipe_out:
TERM0: $ tail -f pipe_in > pipe_out
3.Send string hello world! to pipe_in and expect it to arrive at pipe_out:
TERM1: $ tail -f pipe_out
TERM2: $ echo "hello world!" > pipe_in
I can only see the string arriving at pipe_out if I kill command in 2..
It seems to be a buffering issue so I decided to run all commands above with stdbuf -i0 -e0 -o0 <command> but it didn't work.
pipe fifo mkfifo
pipe fifo mkfifo
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
asked Mar 11 at 16:27
fmagnofmagno
82
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
asked Mar 11 at 16:27
fmagnofmagno
82
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
edited Apr 7 at 14:47
Rui F Ribeiro
42k1483142
42k1483142
asked Mar 11 at 16:27
fmagnofmagno
82
asked Mar 11 at 16:27
fmagnofmagno
82
asked Mar 11 at 16:27
fmagnofmagno
82
82
1
Good point, @Jeff Schaller. I have just deleted that question. I find this one, here, more fundamental. As soon as I solve this one I will likely be able to solve the other one too.
– fmagno
Mar 11 at 16:41
add a comment |
1
Good point, @Jeff Schaller. I have just deleted that question. I find this one, here, more fundamental. As soon as I solve this one I will likely be able to solve the other one too.
– fmagno
Mar 11 at 16:41
1
1
Good point, @Jeff Schaller. I have just deleted that question. I find this one, here, more fundamental. As soon as I solve this one I will likely be able to solve the other one too.
– fmagno
Mar 11 at 16:41
Good point, @Jeff Schaller. I have just deleted that question. I find this one, here, more fundamental. As soon as I solve this one I will likely be able to solve the other one too.
– fmagno
Mar 11 at 16:41
add a comment |
2 Answers
2
active
oldest
votes
tail only outputs the last n lines of a file/stream. While you are still generating lines, it can not know which are the last n.
Have you tried something like cat?
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
Mar 11 at 18:43
add a comment |
Please refer to @ctrl-alt-delor's answer for the reason why it doesn't work. But you can still achieve the same purpose with cat:
answered Mar 11 at 18:24
gmagnogmagno
1013
It is very interesting that it works on your setup. On my setup it doesn't. I am running this on OSX, btw - not sure if it should make any difference, though... Altough, if I replace bothtailcommands bycatit all works fine.
– fmagno
Mar 12 at 10:34
exactly, that is also puzzling me...
– gmagno
Mar 12 at 11:37
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
tail only outputs the last n lines of a file/stream. While you are still generating lines, it can not know which are the last n.
Have you tried something like cat?
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
Mar 11 at 18:43
add a comment |
tail only outputs the last n lines of a file/stream. While you are still generating lines, it can not know which are the last n.
Have you tried something like cat?
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
Mar 11 at 18:43
add a comment |
tail only outputs the last n lines of a file/stream. While you are still generating lines, it can not know which are the last n.
Have you tried something like cat?
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
tail only outputs the last n lines of a file/stream. While you are still generating lines, it can not know which are the last n.
Have you tried something like cat?
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
answered Mar 11 at 17:03
ctrl-alt-delorctrl-alt-delor
12.4k52662
12.4k52662
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
Mar 11 at 18:43
add a comment |
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
Mar 11 at 18:43
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
Mar 11 at 18:43
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
Mar 11 at 18:43
add a comment |
Please refer to @ctrl-alt-delor's answer for the reason why it doesn't work. But you can still achieve the same purpose with cat:
answered Mar 11 at 18:24
gmagnogmagno
1013
It is very interesting that it works on your setup. On my setup it doesn't. I am running this on OSX, btw - not sure if it should make any difference, though... Altough, if I replace bothtailcommands bycatit all works fine.
– fmagno
Mar 12 at 10:34
exactly, that is also puzzling me...
– gmagno
Mar 12 at 11:37
add a comment |
Please refer to @ctrl-alt-delor's answer for the reason why it doesn't work. But you can still achieve the same purpose with cat:
answered Mar 11 at 18:24
gmagnogmagno
1013
It is very interesting that it works on your setup. On my setup it doesn't. I am running this on OSX, btw - not sure if it should make any difference, though... Altough, if I replace bothtailcommands bycatit all works fine.
– fmagno
Mar 12 at 10:34
exactly, that is also puzzling me...
– gmagno
Mar 12 at 11:37
add a comment |
Please refer to @ctrl-alt-delor's answer for the reason why it doesn't work. But you can still achieve the same purpose with cat:
answered Mar 11 at 18:24
gmagnogmagno
1013
Please refer to @ctrl-alt-delor's answer for the reason why it doesn't work. But you can still achieve the same purpose with cat:
answered Mar 11 at 18:24
gmagnogmagno
1013
edited Mar 11 at 18:33
answered Mar 11 at 18:24
gmagnogmagno
1013
answered Mar 11 at 18:24
gmagnogmagno
1013
answered Mar 11 at 18:24
gmagnogmagno
1013
1013
It is very interesting that it works on your setup. On my setup it doesn't. I am running this on OSX, btw - not sure if it should make any difference, though... Altough, if I replace bothtailcommands bycatit all works fine.
– fmagno
Mar 12 at 10:34
exactly, that is also puzzling me...
– gmagno
Mar 12 at 11:37
add a comment |
It is very interesting that it works on your setup. On my setup it doesn't. I am running this on OSX, btw - not sure if it should make any difference, though... Altough, if I replace bothtailcommands bycatit all works fine.
– fmagno
Mar 12 at 10:34
exactly, that is also puzzling me...
– gmagno
Mar 12 at 11:37
It is very interesting that it works on your setup. On my setup it doesn't. I am running this on OSX, btw - not sure if it should make any difference, though... Altough, if I replace both
tail commands by cat it all works fine.– fmagno
Mar 12 at 10:34
It is very interesting that it works on your setup. On my setup it doesn't. I am running this on OSX, btw - not sure if it should make any difference, though... Altough, if I replace both
tail commands by cat it all works fine.– fmagno
Mar 12 at 10:34
exactly, that is also puzzling me...
– gmagno
Mar 12 at 11:37
exactly, that is also puzzling me...
– gmagno
Mar 12 at 11:37
add a comment |
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1
Good point, @Jeff Schaller. I have just deleted that question. I find this one, here, more fundamental. As soon as I solve this one I will likely be able to solve the other one too.
– fmagno
Mar 11 at 16:41