lsblk: Specifying -T without a 'column' parameter results in diagnostic

[ahmogit]

Description:
The man page and --help blurb pertaining to -T, --tree seem to indicate that the 'column' parameter is optional, and if not supplied, it defaults to 'NAME'. This defaulting works as expected if the option is given as --tree, but does not work as expected if given as -T.

Steps to reproduce:

   $ lsblk --tree

produces the expected output, treeified on NAME.

But

    $ lsblk  -T

produces the diagnostic lsblk: option requires an argument -- 'T'

[karelzak]

Good catch. Thanks for your report!

Fixed now. The bugfix will be in releases v2.37 and v2.36.1.