fix broken pipe in journallog

docs/20_Checks/inc_pluginfunctions.md

@@ -389,6 +389,23 @@ if [ $iWarnLimit -gt 0 -a $iCriticalLimit -gt 0 ]; then
 fi 
 ```
 
+### ph.showtimer
+
+Show a time in seconds and milliseconds since start (since source of inc_pluginfunctions.sh).
+You can use it to show an execution time.
+
+Syntax:
+
+```text
+ph.showtimer
+```
+
+It has no parameters.
+
+```shell
+2.410 sec
+```
+
 ### ph.status
 
 Show the current status (set by ``ph.setStatus``) as Text.