about: add help

about

@@ -5,11 +5,14 @@
 # ABOUT
 #
 # ----------------------------------------------------------------------
-# 2020-10-23  v1.0  <axel.hahn@iml.unibe.ch>  initial version
-# 2020-10-25  v1.1  <axel.hahn@iml.unibe.ch>  show disks, show installed versions (WIP)
+# 2023-10-23  v1.0  <axel.hahn@unibe.ch>  initial version
+# 2023-10-25  v1.1  <axel.hahn@unibe.ch>  show disks, show installed versions (WIP)
+# 2023-12-22  v1.2  <axel.hahn@unibe.ch>  show help
 # ======================================================================
 
-. $( dirname $0 )/inc_pluginfunctions
+. $(dirname $0)/inc_pluginfunctions
+
+export self_APPVERSION=1.2
 
 . /etc/icingaclient/client.cfg 2>/dev/null
 
@@ -22,6 +25,32 @@
 # FUNCTIONS
 # ----------------------------------------------------------------------
 
+# show help text
+function showHelp(){
+    local _self; _self=$(basename $0)
+cat <<EOF
+$( ph.showImlHelpHeader )
+
+About ... shows a short summary for the system:
+
+  * operating system
+  * cpu
+  * ram
+  * diskspace
+  * checked services
+
+SYNTAX:
+
+  $_self [-h]
+
+OPTIONS:
+
+  -h, --help 
+      this help
+
+EOF
+}
+
 function _section(){
     echo ">>>>>>>>>> $*"
 }
@@ -30,6 +59,13 @@ function _section(){
 # MAIN
 # ----------------------------------------------------------------------
 
+# --- check param -h
+
+while [[ "$#" -gt 0 ]]; do case $1 in
+    -h|--help)      showHelp; exit 0;;
+    *) echo "ERROR: Unknown parameter: $1"; showHelp; exit 1;
+esac; done
+
 _iCpu=$( grep -c "processor" /proc/cpuinfo )
 _sCpuModel=$(grep "model name" /proc/cpuinfo | sort -u )
 _iMem=$( grep "MemTotal:"   /proc/meminfo | awk '{ print $2 }' )