Have you ever had the problem that your camera's date was misset or reset, so all your EXIF and file dates were broken?
In this case you need to adjust the date in several images and preferably alter the file date accordingly. This is much easier than you thought, two simple commands using Linux tool exiv2.
Ever wondered what extra files you might have on your harddisk, left there by once installed programs or deprecated packages left there by distro upgrades? Try this little script to hunt them down.