I think the following should kill all windows having class Emacs23. The error
message is very confusing:
ubuntu@example:~/.i3$ DISPLAY=:0.0 i3-msg [class="Emacs23"] kill
ERROR: Your command: a kill
ERROR: ^^^^^^
ERROR: Expected one of these tokens: <end>, '[', 'move', 'exec', 'exit',
'restart', 'reload', 'shmlog', 'debuglog', 'border', 'layout', 'append_layout',
'workspace', 'focus', 'kill', 'open', 'fullscreen', 'split', 'floating',
'mark', 'unmark', 'resize', 'rename', 'nop', 'scratchpad', 'mode', 'bar'
[{"success":false,"parse_error":true,"error":"Expected one of these tokens:
<end>, '[', 'move', 'exec', 'exit', 'restart', 'reload', 'shmlog', 'debuglog',
'border', 'layout', 'append_layout', 'workspace', 'focus', 'kill', 'open',
'fullscreen', 'split', 'floating', 'mark', 'unmark', 'resize', 'rename', 'nop',
'scratchpad', 'mode', 'bar'","input":"a kill","errorposition":"^^^^^^"}]
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