How to turn off Emacs's auto line wrapping for the current session?
Depending on which flavor of automatic line wrapping you're using, it'll be one of
M-x toggle-truncate-lines
if your lines wrap hard at the right-hand edge of the window, or
M-x visual-line-mode
if your lines "soft wrap" at the whitespace nearest the right-hand edge of the window.
(If you're using an Emacs version older than 24.4, it may also be M-x longlines-mode
, if your lines wrap hard at a given column.)
If you've issued the wrong command for your configuration, then the message in the minibuffer will say "...enabled" instead of "...disabled"; in that case, just issue the same command again to re-disable the bogus mode, and try the others until you've found the one which disables the mode you're actually using.
These are buffer-local modes, so issuing the command will affect only the buffer you're in when you do so; in all other buffers, you'll still have the benefit of line wrapping unless you similarly turn off the mode there as well.
Should you wish later to turn line-wrapping back on, just reissue the command you used to disable it.
Just an update on longlines-mode
.
As of emacs 24.4, longlines-mode
no longer exists. Therefore I'd recommend using M-x toggle-truncate-lines
if you want it temporarily, or (set-default 'truncate-lines t)
in your .emacs
file if you want it be default in all buffers
Another possibility may be to toggle auto-fill-mode
For example, turning off auto-fill-mode
in auctex stops hard line wrapping