gpg --gen-key

Please select what kind of key you want:
   (1) RSA and RSA (default)
   (2) DSA and Elgamal
   (3) DSA (sign only)
   (4) RSA (sign only)

What keysize do you want? (2048)

Key is valid for? (0)

You need a user ID to identify your key;
the software constructs the user ID
from the Real Name, Comment and Email Address in this form:
"Name Title (some comment) <samplename@example.com>"

Real name: My Name
Email address: example@email.com
Comment: comment
You selected this USER-ID:
"My Name (comment) <example@email.com>"

You need a Passphrase to protect your secret key.

gpg: key XXXXXXXL marked as ultimately trusted
public and secret key created and signed.

pub   ABCDE/XXXXXXXL 2016-06-09
Key fingerprint = XXXX XXXX XXXX XXXX XXXX  XXXX XXXX XXXX XXXX XXXXL
uid                  My Name (comment) <example@email.com>
sub   ABCDE/XXXXXXXM 2016-06-09

export GPGKEY=XXXXXXXM

killall -q gpg-agent
eval $(gpg-agent --daemon)
export GPGKEY=XXXXXXXM

gpg --cert-digest-algo=SHA256 --edit-key XXXXXXXM

Secret key is available.

pub   ABCDE/XXXXXXXM  created: 2016-06-09  expires: never       usage: SC
                     trust: ultimate      validity: ultimate
[ultimate] (1). My Name (comment) <example@email.com>

Command>

addkey

Please select what kind of key you want:
   (2) DSA (sign only)
   (4) Elgamal (encrypt only)
   (5) RSA (sign only)
   (6) RSA (encrypt only)

What keysize do you want? (2048)

Key is valid for? (0)

pub   ABCDE/XXXXXXXL  created: 2016-06-09  expires: never       usage: SC
                     trust: ultimate      validity: ultimate
sub   ABCDE/XXXXXXXM created: 2016-06-09  expires: never
sub   ABCDE/XXXXXXXN created: 2016-06-09  expires: never       usage: E

[ultimate] (1). My Name (comment) <example@email.com>
Command>

save

gpg --list-keys

pub   ABCDE/XXXXXXXL 2016-06-09
uid                  My Name (comment) <example@email.com>
sub   ABCDE/XXXXXXXM 2016-06-09
sub   ABCDE/XXXXXXXN 2016-06-10

`gpg --list-secret-keys`

sec   ABCDE/XXXXXXXL 2016-06-09
uid                  My Name (comment) <example@email.com>
sub   ABCDE/XXXXXXXM 2016-06-09
sub   ABCDE/XXXXXXXN 2016-06-10