diff --git a/onfilechange.sh b/onfilechange.sh
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+#!/bin/bash
+# ======================================================================
+#
+#
+# T R I G G E R C O M M A N D O N A F I L E C H A N G E
+#
+#
+# A Shell script that watches a given file or multiple files.
+# If the file changes then a given command will be exxecuted.
+# It loops permanently; you need to stop it by Ctrl + C and/ or can
+# use it as systemd watcher daemon.
+#
+# It uses stats for wide compatibility but prefers inotifywatch to
+# check a file change.
+#
+# licence: GNU GPL 3.0
+#
+# ----------------------------------------------------------------------
+# 2019-10-14 v1.0 <axel.hahn@iml.unibe.ch> first basic version
+# ======================================================================
+
+# ----------------------------------------------------------------------
+# CONFIG
+# ----------------------------------------------------------------------
+
+bDebug=0
+iSleep=5
+sCommand=
+sWatchFile=
+sMode=
+
+# ---- below are some internal variables
+sVersion=1.0
+
+
+# ----------------------------------------------------------------------
+# FUNCTIONS
+# ----------------------------------------------------------------------
+
+# show help
+function showHelp(){
+cat <<ENDOFHELP
+HELP:
+ This script checks the change of a given file and triggers
+ a command if it changes
+
+PRAMETERS:
+ -c [command]
+ command to execute on a file change
+ -f [filename(s)]
+ filenames to watch; separate multiple files with space and put all in quotes
+ -h
+ show this help
+ -i
+ force inotifywait command
+ -s
+ force stats command
+ -v
+ verbose mode; enable showing debug output
+ -w [integer]
+ for stats mode: wait time in seconds betweeen each test or on missing file; default: 5 sec
+
+EXAMPLES:
+ `basename $0` -f /home/me/touchfile.txt -c "ls -l"
+ watch touchfile.txt and make a file listing on change
+
+ `basename $0` -f "/home/me/touchfile.txt home/me/touchfile2.txt" -c "ls -l"
+ watch touchfile.txt and touchfile2.txt
+
+ `basename $0` -f /home/me/touchfile.txt -s -w 10 -c "ls -l"
+ watch touchfile.txt every 10 sec with stats and make a file listing on change
+
+ENDOFHELP
+
+}
+
+# write debug output ... if debug is enabled only
+#
+# global (bool) $bDebug
+# param string text message to show
+function wd(){
+ if [ $bDebug -ne 0 ]; then
+ echo "[`date`] DEBUG " $*
+ fi
+}
+
+# list watched files
+#
+# global (string) filename(s) to watch
+function listFiles(){
+ echo
+ echo ">>>>> watched files"
+ ls -ld ${sWatchFile} 2>&1
+}
+
+# for stats: helper to get current file status
+#
+# global (string) $sWatchFile
+function getFilestatus(){
+ for myfile in ${sWatchFile}
+ do
+ stat -c "%F %n | perms: %A; user %u (%U) group %g (%G) | size: %s byte | last modification %y" "${myfile}" 2>&1
+ done
+}
+
+# for stats: inititalize file change detection
+#
+# global (string) $TmpFile last/ initial file status
+# global (string) $sTmpFile2 current file status
+function initFilestatus(){
+ getFilestatus >${sTmpFile}
+ wd "`cat ${sTmpFile}`"
+ cp -p ${sTmpFile} ${sTmpFile2}
+}
+
+# for stats: compare file status and execute command on change
+#
+# global (string) $TmpFile last/ initial file status
+# global (string) $sTmpFile2 current file status
+# global (string) $sCommand command to execute
+function compareFilestatus(){
+ getFilestatus >${sTmpFile2}
+ wd "`cat ${sTmpFile2}`"
+ diff ${sTmpFile} ${sTmpFile2}
+ if [ $? -eq 0 ]; then
+ wd "No Change"
+ else
+ wd "Change detected."
+ execCommand
+ if [ $? -eq 0 ]; then
+ echo Command was successfuil.
+ echo
+ wd "Re-Init File status"
+ initFilestatus
+ else
+ echo FAILED.
+ fi
+ fi
+}
+
+# execute a command; called on a file change
+#
+# global (string) $sCommand command line to exectute
+function execCommand(){
+ listFiles
+ echo
+ echo ">>>>> `date` Executing ${sCommand} ..."
+ ${sCommand}
+}
+
+# ----------------------------------------------------------------------
+# MAIN
+# ----------------------------------------------------------------------
+
+cat <<ENDOFHEAD
+____________________________________________________________________________________
+
+ T R I G G E R C O M M A N D O N A F I L E C H A N G E
+____________________________________________________________________________________
+ v${sVersion}
+
+ENDOFHEAD
+
+which inotifywait >/dev/null 2>&1
+if [ $? -ne 0 ]; then
+ echo ERROR: the command inotify was not found on your system,
+ which stat >/dev/null 2>&1
+ if [ $? -ne 0 ]; then
+ echo ERROR: the command stat was not found on your system,
+ exit 2
+ fi
+ echo "INFO: enabling compatibility mode with stats command"
+ sMode=stats
+else
+ echo "INFO: inotifywait command detected"
+ sMode=inotifywait
+fi
+
+if [ $# -eq 0 ]; then
+ showHelp
+ exit 0
+fi
+
+while getopts ":c: :v :f: :h :i :s :w:" opt
+do
+ case $opt in
+ \?|h)
+ showHelp
+ exit 0
+ ;;
+ v)
+ bDebug=1
+ wd "debug is now ${bDebug}"
+ ;;
+ c)
+ sCommand=$OPTARG
+ wd "command is now ${sCommand}"
+ ;;
+ f)
+ sWatchFile=$OPTARG
+ wd "watch file is now ${sWatchFile}"
+ ;;
+ i)
+ sMode=inotifywait
+ wd "forcing mode with inotifywait command"
+ ;;
+ s)
+ sMode=stats
+ wd "forcing mode with stats command"
+ ;;
+ w)
+ typeset -i iSleep=$OPTARG
+ wd "sleep $iSleep sec"
+ ;;
+ :)
+ echo "ERROR: Option -$opt requires an argument." >&2
+ showHelp
+ exit 1
+ esac
+done
+
+cat <<ENDOFINFO
+checking file [${sWatchFile}]
+with command [${sMode}]
+with a sleep time of [${iSleep}] seconds
+and on change start command [${sCommand}]
+
+...............................................................................
+
+
+ENDOFINFO
+
+# ----------------------------------------------------------------------
+# CHECKS
+# ----------------------------------------------------------------------
+
+wd "--- checks"
+if [ -z "${sWatchFile}" ]; then
+ echo ERROR: set a check file with param -f
+ exit 1
+fi
+listFiles
+if [ $? -ne 0 ]; then
+ echo "INFO: file ${sWatchFile} (or one of them) does not exist yet"
+ # echo "ERROR: file ${sWatchFile} (or one of them) does not exist yet"
+ # exit 1
+fi
+
+if [ -z "${sCommand}" ]; then
+ echo ERROR: set a ${sCommand} with param -s
+ exit 1
+fi
+
+# ----------------------------------------------------------------------
+# GO
+# ----------------------------------------------------------------------
+
+myset=`echo ${sWatchFile} | sha1sum | cut -f 1 -d " "`
+sTmpFile="/tmp/`basename $0`-${myset}-last.tmp"
+sTmpFile2="/tmp/`basename $0`-${myset}-current.tmp"
+
+case $sMode in
+ "inotifywait")
+ while true; do
+ listFiles >/dev/null 2>&1
+ if [ $? -eq 0 ]; then
+ inotifywait -e attrib -e modify ${sWatchFile} && execCommand
+ else
+ wd sleep ${iSleep}
+ sleep ${iSleep}
+ echo "WARNING: inotifywait only can notify if all watched files exist. You can use -s to use stats for file detection"
+ fi
+ done
+ ;;
+
+ "stats")
+ wd "--- init"
+ initFilestatus
+ echo waiting for file changes ...
+
+ wd "--- starting loop"
+ while true; do
+ wd sleep ${iSleep}
+ sleep ${iSleep}
+ compareFilestatus
+ done
+ ;;
+esac
+
+# ----------------------------------------------------------------------