man page of gpg command line (Gnupg) has commands to encrypt and decrypt files. Here is a standard command to encrypt/decrypt files with gpg.
gpg --encrypt --recipient [email protected] ~/xxx/xxx.txt - to encrypt
gpg --output ~/xxx/xxx.txt --decrypt ~/xxx/xxx.gpg - to decrypt
But if i have a folder with multiple files and folders, how can i encrypt it with command line?
Solution 1:
Use gpg-zip.
Encrypt the contents of directory mydocs for user Bob to file test1:
gpg-zip --encrypt --output test1 --gpg-args -r Bob mydocs
List the contents of archive test1:
gpg-zip --list-archive test1
This is an example directly from Encrypt or sign files into an archive. If you read that page in detail it will help you out a lot.
Solution 2:
Turn a directory into a file
If you want to encrypt a directory, you will need to convert it to a file first. Run the command:
tar czf myfiles.tar.gz mydirectory/
This gives you a new file 'myfiles.tar.gz' which you can then encrypt/decrypt. To turn a tarball back into a directory:
tar xzf myfiles.tar.gz
now you can use encrypt in the same way that you have above. So:
gpg --encrypt --recipient [email protected] ~/xxx/xxx.txt
This is taken directly from an example on berkeley encrypting, which is also a quick and useful read.
You can review the man page here: gnu gpg man