Read timeout - UNIX
https://www.unix.com/.../252856-read-timeout.html10.11.2014 · If timeout is 0, read returns success if input is available on the speci‐ fied file descriptor, failure otherwise. The exit status is greater than 128 if the timeout is exceeded. -u fd Read input from file descriptor fd. If no names are supplied, the line read is assigned to the variable REPLY.