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A Unix pipe connects file descriptors of two processes. A pipe is created with the POSIX pipe() function declared in <unistd.h>. Shells provide pipe creation between processes using "|".

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'= ' which returns the $SYNC/file.mp3 which then I can pipe into mp3info to get the mp3 information. I have tried without a second sed command but the Environment variable doesn't get expanded and it …
asked Dec 2 '16 by Brett Reinhard
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3answers
from the command returns something like this: $LIGHTS_HOME/music/something.mp3 I then want to pipe that to mp3info to get usable meta data from the mp3 file. However, when I pipe that over to …
asked Dec 5 '16 by Brett Reinhard
1
vote
Essentially, this line of code searches a configuration file /home/pi/lightshowpi/config/state.cfg for the line "file_path =" then expands the environment variable $SYNCHRONIZED_LIGHTS_HOME to its val …
answered Dec 6 '16 by Brett Reinhard
1
vote
I have figured out the answer, it was a simple mistake due to my inexperience with shell grep -w "file_path =" /home/pi/lightshowpi/config/state.cfg | sed 's/.*= //'| sed 's|'\$SYNC'|'/home/pi/sync'| …
answered Dec 2 '16 by Brett Reinhard