If you don't have Go installed, download it from here or install it from your package manager. Next:
go install github.com/Picocrypt/CLI/picocrypt@latest
You should now be able to run picocrypt in your terminal. If not, run export PATH=$PATH:$(go env GOPATH)/bin and try again.
Alternatively, you can use the prebuilt binaries in Releases.
C:\Users\Evan>picocrypt
Usage: picocrypt <item1> [<item2> ...]
Items: can be files, folders, or globs
Flags:
-f (decryption) attempt to fix corruption
-k (decryption) keep output even if corrupted
-p (encryption) use paranoid mode
-r (encryption) encode with Reed-Solomon
To encrypt a single file:
picocrypt secret.pdf
To encrypt all files in the current working directory:
picocrypt *
To encrypt all PNGs and JPGs with paranoid mode and Reed-Solomon:
picocrypt -p -r *.png *.jpg
To decrypt a volume:
picocrypt volume.pcv