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Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Rotate a set of photos matching their EXIF data.
You need jhead package.

Find the package that installed a command

find duplicate processes
This command will allow to search for duplicate processes and sort them by their run count. Note that if there are same processes run by different users you'll see only one user in the result line, so you'll need to do: $ ps aux | grep to see all users that run this command.

intercept stdout/stderr of another process

List your installed Chromium extensions (with url to each page)
Gives you a list for all installed chrome (chromium) extensions with URL to the page of the extension. With this you can easy add a new Bookmark folder called "extensions" add every URL to that folder, so it will be synced and you can access the names from every computer you are logged in. ------------------------------------------------------------------------------------------------------------------ Only tested with chromium, for chrome you maybe have to change the find $PATH.

Mount a truecrypt drive from a file from the command line interactively
It seems to completely void the benefit of having an encrypted folder if you then have a script on your unencrypted hard drive with your password in it. This command will mount a truecrypt file at a given mount point after asking you for the password.

Insert a line at the top of a text file without sed or awk or bash loops
Yet another way to add a line at the top a of text file with the help of the tac command (reverse cat).

Get technical and tag information about a video or audio file
MediaInfo supplies technical and tag information about a video or audio file. (sudo apt install mediainfo)

Make directories for and mount all iso files in a folder


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