Running exa v0.10.1 [-git]

Currently -o defaults to nothing:

$ exa -o
exa: Unknown argument -o

Would be good if the option -o was linked to --octal-permissions.

Also, option --group-directories-first has no shortcut. Both options -G and -g defaults to --grid. You could let -G for --grid but change -g to --group-directories-first. Because in exa --help, most FILTERING AND SORTING OPTIONS uses small caps while "big" caps are used in DISPLAY OPTIONS.