gpg --generate-key

https://www.gnupg.org/documentation/manpage.html

gpg --full-generate-key
gpg (GnuPG) 2.2.27; Copyright (C) 2021 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. 

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)
  (14) Existing key from card
Your selection? 1
RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (3072)
Requested keysize is 3072 bits
Please specify how long the key should be valid.
         0 = key does not expire
      <n>  = key expires in n days
      <n>w = key expires in n weeks
      <n>m = key expires in n months
      <n>y = key expires in n years
Key is valid for? (0) 0
Key does not expire at all
Is this correct? (y/N) y

GnuPG needs to construct a user ID to identify your key.

Related

• gpg --gen-key
• gpg --search-keys
• gpg --send-keys
• gpg --quick-set-expire

See also

• gpg, --batch | --generate-key | --full-generate-key | --recv-keys | --export | --encrypt | --import | --list-keys | --list-secret-key | --gen-key | --armor | --dearmor | --send-keys | --search-keys | --quick-set-expire | --keyserver | --delete-keys | --full-generate-key | --armor --export | gpg --help