C-xh runs the command mark-whole-buffer (select all)
M-w runs the command kill-ring-save (copy)
As with many programs, you can find both "Select All" and "Copy" in the Edit menu — where you can also see the aforementioned key bindings being advertised.
As phils said, you can find it in the Edit menu, with the main keyboard shortcut C-xh.
Furthermore, you can see ALL the key bindings by typing ctrl-hk and then clicking menu Edit > Select All, leading emacs to open an *Help* buffer containing:
<menu-bar> <edit> <mark-whole-buffer> runs the command mark-whole-buffer (found in global-map)
It is bound to s-a, C-x h, <menu-bar> <edit> <mark-whole-buffer>.
You may notice the key binding s-a which means super-a (thanks phils) and, on the mac, refers to the standard shortcut cmd-a (press and hold the cmd modifier and type the letter a).
Otherwise, on any emacs, you may also type M-xmark-whole-bufferRET (which can be useful if you want to insert in an emacs-lisp function) or the sequence M-<C-xSPACEM-> (which can be useful if you want to skip the first line of the buffer for example).
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Answers
mark-whole-buffer(select all)kill-ring-save(copy)As with many programs, you can find both "Select All" and "Copy" in the
Editmenu — where you can also see the aforementioned key bindings being advertised.As phils said, you can find it in the
Editmenu, with the main keyboard shortcutC-xh.Furthermore, you can see ALL the key bindings by typing
ctrl-hkand then clicking menuEdit>Select All, leading emacs to open an*Help*buffer containing:You may notice the key binding
s-awhich meanssuper-a(thanks phils) and, on the mac, refers to the standard shortcutcmd-a(press and hold thecmdmodifier and type the lettera).Otherwise, on any emacs, you may also type
M-xmark-whole-bufferRET(which can be useful if you want to insert in an emacs-lisp function) or the sequenceM-<C-xSPACEM->(which can be useful if you want to skip the first line of the buffer for example).