问题
I'm trying to write to a named pipe, made with mkfifo. But when I run the command, (ex) ls > myNamedPipe, I can no longer enter commands into the bash. I can still write characters and that's pretty much it.
回答1:
A named pipe remains opened until you read it from some other place. This is to permit communication between different processes.
Try:
mkfifo fifo
echo "foo" > fifo
Then open another terminal and type:
cat fifo
If you return to you first terminal, you'll notice that you can now enter other commands.
See also what happends with the reverse :
# terminal 1
cat fifo
# terminal 2
echo "foo" > fifo
# and now you can see "foo" on terminal 1
If you want you terminal not to "hang on" when trying to write something to the fifo, attach to the fifo a file descriptor :
mkfifo fifo
exec 3<> fifo
echo "foo" > fifo
echo "bar" > fifo
来源：https://stackoverflow.com/questions/15376562/cant-write-to-named-pipe