Show help on invalid option

Signed-off-by: Rohan Jain <crodjer@gmail.com>
One less newline for help text

Signed-off-by: Rohan Jain <crodjer@gmail.com>
Fix inotify boolean flags settings

Signed-off-by: Rohan Jain <crodjer@gmail.com>
Richer set of placeholders and usage examples

Allows for a combinations which can execute even more complicated
commands.

Signed-off-by: Rohan Jain <crodjer@gmail.com>