Two named PIPEs (PIPE_in/PIPE_out) connected with `tail -f` | String sent to PIPE_in doesn't reach PIPE_out
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 help...
Can anyone help with this please?
pipe fifo mkfifo
asked 2 hours ago
fmagnofmagno
61
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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 help...
Can anyone help with this please?
pipe fifo mkfifo
asked 2 hours ago
fmagnofmagno
61
New contributor
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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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
2 hours ago
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 help...
Can anyone help with this please?
pipe fifo mkfifo
asked 2 hours ago
fmagnofmagno
61
New contributor
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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 help...
Can anyone help with this please?
pipe fifo mkfifo
pipe fifo mkfifo
asked 2 hours ago
fmagnofmagno
61
New contributor
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
fmagnofmagno
61
New contributor
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
fmagnofmagno
61
New contributor
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 hours ago
fmagnofmagno
61
asked 2 hours ago
fmagnofmagno
61
61
New contributor
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
fmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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
2 hours ago
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
2 hours ago
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
2 hours ago
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
2 hours ago
add a comment |
2 Answers
2
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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 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
21 mins ago
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 40 mins ago
gmagnogmagno
1013
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
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active
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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 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
21 mins ago
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 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
21 mins ago
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 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
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 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
answered 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
answered 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
answered 2 hours ago
ctrl-alt-delorctrl-alt-delor
11.9k42260
11.9k42260
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
21 mins ago
add a comment |
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
21 mins ago
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
21 mins ago
It is interesting though that the tail from one pipe to the other works as expected :)
– gmagno
21 mins ago
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 40 mins ago
gmagnogmagno
1013
New contributor
gmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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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 40 mins ago
gmagnogmagno
1013
New contributor
gmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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 40 mins ago
gmagnogmagno
1013
New contributor
gmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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 40 mins ago
gmagnogmagno
1013
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gmagno is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 32 mins ago
answered 40 mins ago
gmagnogmagno
1013
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answered 40 mins ago
gmagnogmagno
1013
answered 40 mins ago
gmagnogmagno
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1013
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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
2 hours ago