Add System V Init script and systemd unit, update README.md

contrib/reniced.init

@@ -0,0 +1,64 @@
+#!/bin/bash
+# Start/stop/restart reniced.
+
+### BEGIN INIT INFO
+# Provides:          reniced
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Start the reniced service.
+# Description:       Service that periodically checks and changes runtime niceness of given (by name) processes.
+### END INIT INFO
+
+
+# Start reniced:
+_start() {
+  echo -n "Starting Reniced daemon:  /usr/sbin/reniced"
+  /usr/sbin/reniced
+  echo
+}
+
+# Stop reniced:
+_stop() {
+  echo -n "Stopping Reniced daemon..."
+  if [ -r /var/run/reniced.pid ]; then
+    kill -HUP "$(cat /var/run/reniced.pid)"
+    rm -f "/var/run/reniced.pid"
+  else
+    killall -HUP -q reniced
+  fi
+  echo
+}
+
+# Restart renicedd:
+_restart() {
+  _stop
+  sleep 1
+  _start
+}
+
+# Check if reniced is running
+_status() {
+  if [ -e /var/run/reniced.pid ]; then
+    echo "reniced is running as pid $(cat /run/reniced.pid)."
+  else 
+    echo "reniced is stopped."
+    exit 1
+  fi
+}
+
+case "$1" in
+'start')
+  _start
+  ;;
+'stop')
+  _stop
+  ;;
+'restart')
+  _restart
+  ;;
+'status')
+  _status
+  ;;
+*)
+  echo "usage $0 start|stop|restart|status"
+esac