Implement timeout command for systems that don't have it

timeout.sh

## @author  Jay Goldberg
## @email  [email protected]
## @license  Apache 2.0
## @description  Implement timeout for systems that don't have it
## @usage  source it, then timeout <secs> <command>
#=======================================================================

timeout() {
  local timeout_secs=${1:-10}
  shift
 
  [ ! -z "${timeout_secs//[0-9]}" ] && { return 65; }
  
  # subshell
  ( 
    "$@" &
    child=$!     #trap - '' SIGTERM #why would we need this?
    (       
      sleep $timeout_secs
      kill $child 2> /dev/null # TODO returns 143 instead of "real" timeout's 124
    ) &
    wait $child
  )
}