Type: string
Default: "%4n %t%f %4l/0x%k %-4a %2c %u"
This variable allows you to customize the PGP key selection menu to your personal taste. This string is similar to `` $index_format'', but has its own set of printf()-like sequences:
number
key id
user id
algorithm
key length
flags
capabilities
trust/validity of the key-uid association
date of the key where <s> is an strftime(3) expression