Run a shell command when a file is added

Question

I have a folder named images on my linux box. This folder is connected to a website and the admin of the site has the ability to add pictures to this site. However, when a

Answer 1

#!/bin/bash

tail -F -n0 /var/log/vsftpd.log | while read line; do
  if echo "$line" | grep -q 'OK UPLOAD:'; then
    filename=$(echo $line | cut -d, -f2 |awk '{print $1}')
    filename="${filename%\"}"
    filename="${filename#\"}"
    #sleep 1s
    if [ -s $filename ]; then
      # do something with $filename
      echo $filename
    fi
  fi
done