If I run the following in one tty:
nc -l localhost 9000 | /tmp/z
...where /tmp/z has just:
#!/usr/bin/python3
import sys
for line in sys.stdin.buffer:
print(line)
And then run the following in another tty on the same computer:
while read line; do echo $line; sleep 1; done < /etc/passwd | nc
localhost 9000
...then everything acts line buffered, or perhaps even character
buffered (the two are pretty indistinguishable in this test). What I
see is my /etc/passwd file popping out of the nc -l side, one line at
a time, each line one second apart.
I suppose this suggests that it's the client that's sending TCP data
that is buffering.
That, or we're using two different versions of netcat (there are at
least two available).
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