20 years? more like 5

this post seems nice and succinct, not sure about ECC but RSA certainly seems easy enough

have you tried openssl?

assuming you have a GNU toolchain you can use the find command like so:

find . -type f -executable -exec sh -c '
case $( file "$1" ) in (*Bourne-Again*) exit 0; esac
exit 1' sh {} \; -print0 | xargs -0 -I{} cp {} target/

This first finds all executable files in the current directory (change the “.” arg in find to search other dirs), uses the file command to test if it’s a bash file, and if it is, pipes the file name to xargs which calls cp on each file.

note: if “target” is inside the search directory you’ll get output from cp that it skipped copying identical files. this is because find will find them a free you copy them so be careful!

note 2: this doesn’t preserve the directory structure of the files, so if your scripts are nested and might have duplicate names, you’ll get errors.

I realize I’m late to this thread, but if you’re serious about archiving a VHS in the best manner possible, you have to go the RF capture route: https://github.com/oyvindln/vhs-decode

This method effectively captures the “raw” signal stored on the tape, allowing you to convert it after you’ve captured it however you see fit. You don’t have to worry about cheap digitizers/capture cards/etc distorting the signal.