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When you type CTRL/R (control-R), the monitor reprints the current
input line. If you type a line incorrectly, then make corrections
using the DELETE key, the monitor will print the corrected line when
you type CTRL/R. The following is an example of this operation using
a hard-copy terminal:
If you type:
SET TTQ<DEL>Y N0<DEL>O FILE<DEL>L
The line appears as:
.SET TTQ\Q\Y N0\0\O FILE\E\L
If you then press CTRL/R:
.SET TTQ\Q\Y N0\0\O FILE\E\L ^R
The monitor prints:
SET TTY NO FILL
When you type CTRL/R, the monitor issues a carriage-return/line-feed
before printing the corrected input line. The cursor or printing head
of your terminal is left at its previous location.
If a program such as your text editor uses CTRL/R for another purpose,
you can disable the CTRL/R function using the SET TTY RTCOMP command.