dist/init/linux-sysvinit: process @weingart's feedback (#1008)

* dist/init/linux-sysvinit: use kill -0 to test process status

* dist/init/linux-sysvinit: use service (as root) instead of /etc/init.d/

dist/init/linux-sysvinit/README.md

@@ -8,4 +8,4 @@ Usage
 * Save the SysVinit config file in `/etc/init.d/caddy`.
 * Ensure that the folder `/etc/caddy` exists and that the subfolder `ssl` is owned by `www-data`.
 * Create a Caddyfile in `/etc/caddy/Caddyfile`
-* Now you can use `sudo /etc/init.d/caddy start|stop|restart|reload|status`.
+* Now you can use `service caddy start|stop|restart|reload|status` as `root`.

dist/init/linux-sysvinit/caddy

@@ -53,11 +53,10 @@ reload() {
 
 status() {
     if [ -f $PIDFILE ]; then
-        PID=`cat $PIDFILE`
-        if [ -z "`ps axf | grep ${PID} | grep -v grep`" ]; then
-            echo "$NAME process is dead, but pidfile exists"
-        else
+        if kill -0 $(cat "$PIDFILE"); then
             echo "$NAME is running"
+        else
+            echo "$NAME process is dead, but pidfile exists"
         fi
     else
         echo "$NAME is not running"