Features

Overall Features

Line editing
History (search, persistence)
Completion
Masking
Undo and Redo
Paste buffer
Emacs and Vi editing mode
Supports POSIX OS's and Windows
Easy to configure (history file & buffer size, edit mode, streams, possible to override terminal impls, etc)

Keys that are mapped by default in Æsh

Note: C equals Control and M is Meta/Alt

EMACS Mode

Move back one char : C-b or left arrow
Move forward one char : C-f or right arrow
Delete the character left of cursor : backspace
Delete the character on cursor : C-d
Undo : C-_ or C-x C-u
Move to the start of the line : C-a or home
Move to the end of the line : C-e or end
Move forward a word, where a word is composed of letters and digits : M-f
Move backward a word : M-b
Previous line : up arrow
Next line : down arrow
Clear the screen, reprinting the current line at the top : C-l
Delete next word to the right of cursor : M-d
Complete : tab
Kill the text from the current cursor position to the end of the line : C-k
Kill from the cursor to the end of the current word, or, if between words, to the end of the next word : M-d
Kill from the cursor to the previous whitespace : C-w
Yank the most recently killed text back into the buffer at the cursor : C-y
Search backward in the history for a particular string : C-r
Search forward in the history for a particular string : C-s
Switch to VI editing mode: M-C-j

VI Mode

In command mode: About every vi command is supported, here's a few:

Move back one char : h
Move forward one char : l
Delete the character left of cursor : X
Delete the character on cursor : x
Undo : u
Move to the start of the line : 0
Move to the end of the line : $
Move forward a word, where a word is composed of letters and digits : w
Move backward a word : b
Previous line : k
Next line : n
Clear the screen, reprinting the current line at the top : C-l
Delete next word to the right of cursor : dw
Kill the text from the current cursor position to the end of the line : D and d$
Kill from the cursor to the end of the current word, or, if between words, to the end of the next word : db
Kill from the cursor to the previous whitespace : dB
Yank the most recently killed text back into the buffer at the cursor : p (after cursor), P (before cursor)
Add text into yank buffer : y + movement action
Enable change mode : c
Repeat previous action : .
+++ (read a vi manual)

In edit mode: