Apparently we are missing login subcommand from the --help message
~/ shifterimg --help
Usage:
shifterimg [options] <mode> <type:tag>
Mode: images, lookup, or pull
Options:
--user/-u <list> List of users allowed to access a private image
--group/-g <list> List of groups allowed to access a private image
--verbose/-v Verbose output
--help/-h Display this help
Note: the --user and --group options are only relevant for image pulls
Apparently we are missing
login
subcommand from the --help message