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(screen.info)Specials

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Specials
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   There are, however, some keys that act differently here from in
`vi'.  `Vi' does not allow to yank rectangular blocks of text, but
`screen' does. Press

`c' or `C' to set the left or right margin respectively. If no repeat
count is given, both default to the current cursor position.
Example: Try this on a rather full text screen: `C-a [ M 20 l SPACE c
10 l 5 j C SPACE'.

This moves one to the middle line of the screen, moves in 20 columns
left, marks the beginning of the paste buffer, sets the left column,
moves 5 columns down, sets the right column, and then marks the end of
the paste buffer. Now try:
`C-a [ M 20 l SPACE 10 l 5 j SPACE'

and notice the difference in the amount of text copied.

`J' joins lines. It toggles between 4 modes: lines separated by a
newline character (012), lines glued seamless, lines separated by a
single space or comma separated lines. Note that you can prepend the
newline character with a carriage return character, by issuing a `set
crlf on'.

`v' is for all the `vi' users who use `:set numbers' - it toggles the
left margin between column 9 and 1.

`a' before the final space key turns on append mode. Thus the contents
of the paste buffer will not be overwritten, but appended to.

`A' turns on append mode and sets a (second) mark.

`>' sets the (second) mark and writes the contents of the paste buffer
to the screen-exchange file (`/tmp/screen-exchange' per default) once
copy-mode is finished.  Note: Screen Exchange.
This example demonstrates how to dump the whole scrollback buffer to
that file:
`C-a [ g SPACE G $ >'.

`C-g' gives information about the current line and column.

`x' exchanges the first mark and the current cursor position. You can
use this to adjust an already placed mark.

`@' does nothing.  Absolutely nothing.  Does not even exit copy mode.

All keys not described here exit copy mode.