Script for incron to add or remove entries from an incrontab file

sync2incron.sh

#!/bin/bash

###
# sync2incron - Script for incron to add or remove entries from an incrontab file
#
# Usage:
#
# - Add it to incron as something like:
# /root/path/to/monitor IN_CREATE,IN_DELETE /path/to/sync2incron.sh $% /etc/incron.d/myincrontab $@/$# IN_CLOSE_WRITE myscript $$@/$$#
#
# - Little aid in creating the incrontab file with directories that have 14 numbers only in name. You may remove or change the regex to fit your needs:
# find /root/path/to/monitor -type d -regextype sed -regex ".*/[0-9]\{14\}/" -print0 | xargs -0 -I{} echo "{} IN_CLOSE_WRITE myscript \$@/\$#" > /etc/incron.d/myincrontab
#
#
# Changelog:
#
# 1.0 - 2016/08/25 - allan (at) Spotapp .mobi
# - First version
#
# --
# By Allan Brazute - EthraZa (at) gmail .com
###

if [ $# -gt 4 ]; then
        if [ -f "$2" ]; then
                ln="${@:3}"
                if [[ $1 == *"CREATE"* ]]; then
                        if [ `grep -c "$ln" "$2"` -gt 0 ]; then
                                echo "$3 is already on incrontab"
                        else
                                echo "${@:3}" >> $2
                                echo "$3 added to $2"
                        fi
                elif [[ $1 == *"DELETE"* ]]; then
                        if [ `grep -c "$ln" "$2"` -gt 0 ]; then
                                cp -f "$2" "/tmp/`basename $2`.bak"
                                grep -hsv "$ln" "/tmp/`basename $2`.bak" > "$2"
                                echo "$3 deleted from $2"
                        else
                                echo "$3 not found on $2"
                        fi
                fi
        else
                echo "Incrontab $2 not found"
        fi
else
        echo "We need some parameters to work with:" 
        echo "What to do (CREATE or DELETE); Path to incrontab file; Incron line to append or remove from incrontab;"
        echo "Usage: sync2incron.sh CREATE /etc/incron.d/myincrontab /var/www/clients IN_CLOSE_WRITE myscript \\\$@/\\\$#"
fi

This is a generic bash script to monitor a directory with incron and add or remove new entries in this directory to an incrontab file to monitor too.
It is write in a simple manner so any one can use it and edit it to fit less generic needs.
If used with creativity it may give you a recursive incron. ;)

Thank you worked a treat - and no Python in sight 🥇 Using it to transcode security video files after creation. Very useful feature is the removal of watch directories from the table as in my case a new folder is created on with the first video of the day and folders are retained for period before being cleared and removed automatically. The videos created are uncompressed so being able to transcode asap after creation is very useful.