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Your test did work. A Julia script was copied onto a USB pen drive and then removed from the command line with 'rm'. PhotoRec was able to find the deleted Julia script, searching the unallocated space.

PhotoRec searched the entire partition for *.txt files, but the Julia scripts were not found. A search for 'JuMP' (which appeared in all of the Julia scripts) was not found in any of the text files found by PhotoRec. PhotoRec did not give the option to only search over the unallocated space in the ...

Yes, the files were deleted on a SSD. The folder that was deleted ('/home/stuart/julia_code/Gen7_BPM/archive_6_29_2024') was on the partition /dev/nvme0n1p2, which is an ext4 file system.

$ lsblk -o name,rota
NAME ROTA
loop0 0
loop2 0
loop3 0
loop4 0
loop5 0
sda 0
└─sda1 0
nvme0n1 0
├─nvme0n1p1 0 ...

The files were deleted on an ext4 drive. I will have to check if it is a SSD.

I removed a folder in my home directory on Ubuntu Linux via: 'rm -r folder_name'. The folder contained a bunch of Julia (.jl) scripts in several subfolders contained in folder_name. Is it possible to recover the .jl files using PhotoRec?