I was trying to learn how to use the bind-key [-cnr] [-t key-table] key command [arguments] better, but was having some trouble figuring out what valid keys are for bind-key command.I tried doing man tmux and Google too, but I couldn't find anything useful.How can I figure out what the syntax for valid keys are?Is there a help command or a man page for this?Maybe I don't know the technical term for this valid keys, is there a term for these keys so that I can do a better google search?For example, I was trying to figure out what the following remapping of commands meant:bind-key -n M-S-Left resize-pane -L 2bind-key -n M-S-Right resize-pane -R 2bind-key -n M-S-Up resize-pane -U 2bind-key -n M-S-Down resize-pane -D 4The -n was easy to find in the man page (doesn't need prefix). But I can't figure out what M-S-Left key means.I am guessing that its mapping shift and the left arrow plus whatever M means to the resize-pane -L 2 command.How do I figure out what M means?What if I wanted control + whatever key I wanted. Is control = C ?How can I figure this out without just trying random keys on my keyboard until something works?Also, how do I confirm, figure out if I am not mapping it to a key set that is already used?Is there such a thing as show all aliases or something?As an addition to the question, are these valid keys the same as the ones for vim?The thing is that vim seems to have a different scripting for its own language since it sometimes require  and stuff. 
What are valid keys for tmux?
tmux;key mapping
Available KeysLook at man tmux, search / for KEY BINDINGS:tmux allows a command to be bound to most keys, with or without a prefix key.When specifying keys, most represent themselves (for example A to Z).   Ctrl keys may be prefixed with C- or ^, and Alt (meta) with M-.In addition, the following special key names are accepted:Up, Down, Left, Right, BSpace, BTab, DC (Delete), End, Enter, Escape, F1 to F20,   Home, IC (Insert), NPage/PageDown/PgDn, PPage/PageUp/PgUp, Space, and Tab.   Note that to bind the  or ' keys, quotation marks are necessary [...]M-S-Left should be Alt+Shift+Left for example.List all bound keysTo list all key bindings, simply press Ctrl-b then ? while in a tmux session.This is also documented in man tmux in section EXAMPLES:Typing C-b ? lists the current key bindings in the current window; up and down may be used to navigate the list or q to exit from it.You can also list all key-bindings via tmux list-keys. If you want to check for already set keys, you can grep it's output to check, if it's already set.ResearchTo find more via Google, search for Section names in man tmux - just type in tmux default key bindings for example :). But often man tmux is sufficient.This site is a very good documentation about tmux and pops up, if you search for said string in Google.Arch wiki is always good, too.