I am tasked to explain the variation of gpg errors that happened in one of my batch script. Currently when I perform gpg decrypt for a specified file it returns 2. The problem with this is when I search the form, it shows that the file has been decrypted properly but the error code is causing the script to stop because it only assumed that 0 is the only success value.gpg -o XXX --decrypt XXX.gpgRETVAL=$?if [ RETVAL -ne 0 ]; then    exit 1fiI searched the net and found the header list for gpg. It defines error 2 as Unknown Packet.http://www.gnu-darwin.org/www001/src/ports/security/libgpg-error/work/libgpg-error-1.5/src/err-codes.h.inThe normal error text being displayed is [gpg: [don't know]: invalid packet (ctb=14)].What exactly does the unknown packet mean? I am trying to search any documents on understanding the error codes. After showing all the verbose information using the [-vv] option. I compared the resulting gpg file decryption with a file that returns 0 code.The only thing I noticed is the byte of the key is different.The decryption of the gpg that is error free have the following log::pubkey enc packet: version 3, algo 16, keyid <16-hexdigit>    data    1023 bits    data    1024 bitsThe decryption of the gpg causing error have the following log::pubkey enc packet: version 3, algo 16, keyid <16-hexdigit>    data    1022 bits    data    1022 bitsWhat does this mean? why can it still be decrypted properly even if the key bit is not the same? Note that the key-id and passphrase used to decrypt the two file are the same. Also, does anyone know any detailed resource on explaining the error of gpg.
What does gpg error code 2(GPG_ERR_UNKNOWN_PACKET) mean?
gpg;return status