tee pipe

tee_pipe.txt

ル╹ヮ╹ルɔ jolokia:~
% (yes | tee /tmp/yes.txt | while read; do sleep 1; done) &
[1] 303
ル╹ヮ╹ルɔ jolokia:~
% while true; do sleep 1; ls -lh /tmp/yes.txt; done        
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
-rw-r--r-- 1 plaster plaster 64K Dec 22 02:20 /tmp/yes.txt
^C

tee_pipe_strace.txt

# thanks to @hio: https://twitter.com/hio/status/811624580364144640
ル╹ヮ╹ルɔ jolokia:~
% (yes | strace -e write -o /tmp/tee-strace.log tee /tmp/yes.txt | while read; do sleep 1; done) &                             
[1] 738
ル╹ヮ╹ルɔ jolokia:~
% tail -f /tmp/tee-strace.log 
write(3, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(1, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(3, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(1, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(3, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(1, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(3, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(1, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(3, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192) = 8192
write(1, "y\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\ny\n"..., 8192