I found this executable testdisk in version 8.2 /usr/bin - clicking on it gives choices Executable or Execute in Terminal
clicking either does...
Computer Photo History IBM 360 ENIAC Apple 1 UNIVAC PDP-8/F JOHNNIAC Altair 8800 For Sale
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Computer Photo History IBM 360 ENIAC Apple 1 UNIVAC PDP-8/F JOHNNIAC Altair 8800: $37
Lavish Color History of ComputingOver 150 Glossy Pages of PhotosNearly every important (or unusual) computer manufactured over the past 70 years, in gloriouscolor - from consoles to circuit boards. The complete table of contents is shownbelow. Apart from some moderate cover wear, the book is in very good condition. Hardcover, 158 pages. Measures9.25" x 11" by 0.75" thick. This item ships WORLDWIDE. THIS sale IS FOR A BOOK. THERE IS NO HARDWARE FOR SALE.