[/boot]
[/dev]
[/etc]
[/home]

find /* -maxdepth 0 -type d -printf '[%p]n'

[/boot]
[/dev]
[/etc]
[/home]
[/lost+found]
[/media]
[/mnt]
[/opt]
[/proc]
[/root]
[/run]
[/srv]
[/sys]
[/tmp]
[/usr]
[/var]

$ for i in /*/; do echo [$i]; done
[/bin/]
[/boot/]
[/dev/]
[/etc/]
[/home/]
...