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I cooked up a command line interface to Simplenote. It's written in Python and uses Urwid for console management.
sncli has a full terminal "gui" mode with vi-like keybinds (configurable!) and also supports typical command line operations useful for scripting. More importantly it supports both online and offline modes.
https://github.com/insanum/sncli
AUR: sncli-git
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