Final answer:
To confirm a file as generated by GPG after removing the original, look for a .gpg or .asc file extension, which are standard for GPG-encrypted files.
Step-by-step explanation:
To confirm that the remaining file is indeed the one generated by GPG (GNU Privacy Guard), you would typically look for a file extension specific to GPG-encrypted files. When GPG encrypts files, it commonly uses the .gpg or .asc file extensions, with .gpg being used for binary files and .asc indicating an ASCII-armored file. However, the file extension may vary if a different convention was used during encryption. After removing the original file containing email addresses, you can use a file listing command relevant to your operating system to ensure that the file with the expected GPG file extension is present.