I have a thing that I only wrote in bash as a stunt to see if I could. It interacts with a hardware device over rs232, and the protocol is all polling and timeo

I have a thing that I only wrote in bash as a stunt to see if I could. It interacts with a hardware device over rs232, and the protocol is all polling and timeouts. So it needs to sleep for short durations many bezillion times, and bash has no built-in sleep like ksh does, and I don't want the script to rely on plugins. So.... _sleep () { read -t ${1:-1} -u 4 ;: } readonly sleep_fifo="${XDG_RUNTIME_DIR:-/tmp}/.${0//\//_}.${LOGNAME:-$$}.sleep.fifo" [[ -p ${sleep_fifo} ]] || mkfifo -m 600 "${sleep_fifo}" || abrt "Error creating \"${sleep_fifo}\"" exec 4<>${sleep_fifo}