Script that copies files written to a specific folder to a different backup folder.

inotifywait-folder-watcher.sh

#!/bin/bash

SRC_DIR=$1
DST_DIR=$2

if ! [ -d "$SRC_DIR" ]; then
    echo "Directory specified to watch does not exist."
fi

if ! [ -d "$DST_DIR" ]; then
    echo "Destination directory specified does not exist."
fi

echo "Waiting to backup new files from [$SRC_DIR] to [$DST_DIR]."

inotifywait -m $SRC_DIR -e close_write |
    while read path action file; do
        if [ 'CLOSE_WRITE,CLOSE' = "$action" ] ; then
            echo "Backing up new file: $file"
            cp -vf "$path/$file" "$DST_DIR/$file"
        fi
    done