check_cronjobs: add more details

docs/20_Checks/check_cronstatus.md

@@ -3,20 +3,60 @@
 ## Introduction
 
 Show status of all Cronjobs using Axels Cronwrapper
-https://github.com/axelhahn/cronwrapper
 
-The last run of each job is verified to these conditions:
+📄 Source: <https://github.com/axelhahn/cronwrapper>\
+📜 License: GNU GPL 3.0\
+📖 Docs: see docs folder or online <https://www.axel-hahn.de/docs/cronwrapper/>
+
+Pre conditions:
+
+* The cronwrapper must be installed
+* Your cronjob(s) must be changed to use the wrapper, eg.\
+ `*/60 * * * * /opt/cronwrappre.sh 60 <YOUR_COMMAND>`
+
+`check_cronstatus` executes the cronstatus.sh in the cronwrapper installation directory and will parse its output.
+
+In the cronstatus the last run of each job will be verified with these conditions:
 
 * exitcode was 0
 * last run is younger than given TTL
 
+As output you get a summary of all checks followed by more detailed status per job.
+
 ## Syntax
 
-`$ check_cronstatus [-h] [SCRIPT]`
+`$ check_cronstatus [-h]`
+
+or
+
+`$ check_cronstatus [SCRIPT]`
+
 
 ### Parameters
 
 ```text
+______________________________________________________________________
+
+CHECK_CRONSTATUS
+v2.4
+
+(c) Institute for Medical Education - University of Bern
+Licence: GNU GPL 3
+
+https://os-docs.iml.unibe.ch/icinga-checks/Checks/check_cronstatus.html
+______________________________________________________________________
+
+Show status of all Cronjobs using Axels Cronwrapper
+https://github.com/axelhahn/cronwrapper
+
+The last run of each job is verified to these conditions:
+- exitcode was 0
+- last run is younger than given TTL
+
+
+SYNTAX:
+check_cronstatus [-h] [SCRIPT]
+
 OPTIONS:
 
     -h or --help   show this help.
@@ -25,6 +65,7 @@ PARAMETERS:
 
     SCRIPT         optional: custom status script
                    default: /opt/cronwrapper/cronstatus.sh
+
 ```
 
 ## Examples
@@ -34,3 +75,4 @@ PARAMETERS:
 
 `check_cronstatus /usr/share/cronwrapper/cronstatus.sh`
     The Check of cronjobs with custom loction.
+    The parameter must reference cronstatus.sh with its full path
\ No newline at end of file