cgsecurity.org

Good morning,
I want to use testdisk from the Knoppix 8.2 distribution.
I cannot start testdisk. For every tip I am grateful for the command I can use to start testdisk in the terminal.
Greetings Paula

What problem do you have with the version included in Knoppix ?
You need to start a terminal and run testdisk.
Otherwise https://www.cgsecurity.org/testdisk.pdf shows how to download latest version or even compile the latest version and start it.