Read-eval-print-loop
- Keyboard shortcuts
- Special variables

Read-eval-print-loop

deno repl starts an read-eval-print-loop, which lets you interactively build up program state in the global context.

Keyboard shortcuts

Keystroke	Action
Ctrl-A, Home	Move cursor to the beginning of line
Ctrl-B, Left	Move cursor one character left
Ctrl-C	Interrupt and cancel the current edit
Ctrl-D	If if line is empty, signal end of line
Ctrl-D, Del	If line is not empty, delete character under cursor
Ctrl-E, End	Move cursor to end of line
Ctrl-F, Right	Move cursor one character right
Ctrl-H, Backspace	Delete character before cursor
Ctrl-I, Tab	Next completion
Ctrl-J, Ctrl-M, Enter	Finish the line entry
Ctrl-K	Delete from cursor to end of line
Ctrl-L	Clear screen
Ctrl-N, Down	Next match from history
Ctrl-P, Up	Previous match from history
Ctrl-R	Reverse Search history (Ctrl-S forward, Ctrl-G cancel)
Ctrl-T	Transpose previous character with current character
Ctrl-U	Delete from start of line to cursor
Ctrl-V	Insert any special character without performing its associated action
Ctrl-W	Delete word leading up to cursor (using white space as a word boundary)
Ctrl-X Ctrl-U	Undo
Ctrl-Y	Paste from Yank buffer
Ctrl-Y	Paste from Yank buffer (Meta-Y to paste next yank instead)
Ctrl-Z	Suspend (Unix only)
Ctrl-_	Undo
Meta-0, 1, …, -	Specify the digit to the argument. `–` starts a negative argument.
Meta-<	Move to first entry in history
Meta->	Move to last entry in history
Meta-B, Alt-Left	Move cursor to previous word
Meta-Backspace	Kill from the start of the current word, or, if between words, to the start of the previous word
Meta-C	Capitalize the current word
Meta-D	Delete forwards one word
Meta-F, Alt-Right	Move cursor to next word
Meta-L	Lower-case the next word
Meta-T	Transpose words
Meta-U	Upper-case the next word
Meta-Y	See Ctrl-Y

Special variables

Identifier	Description
_	Yields the last evaluated expression
_error	Yields the last thrown error