Like how carriage returns return the carriage, like how new lines cause a new line, back space moves the cursor back one space. It does not erase, just moves the cursor. This behavior happens wholly within the terminal, backspace is still just another character as far as any programs are concerned:
That's really all there is to it.
Last edited by Corona688; 12-11-2010 at 10:37 PM..
Hi,
when I make a mistake and then try to backspace I am unable to do so . Can someone please suggest How I can correct this on my session
For Eg:
pwd^H^H^H
Thanks
rooh (2 Replies)
My AIX has Korn Shell. I had set the prompt by providing assigning to PS1. If on the prompt I use backspace it erase the whatever appeared due to PS1. Can someone tell me how to forbid this erasing of prompt string, with this behaviour?
Thanks in advance. (4 Replies)
Hello, I am a UNIX newbie. With that out of that way..
In order to delete a mistyped character, I need to press control+h to move the cursor to the left, and then overwrite it. If I try hitting the backspace key, it just brings me to a new prompt.
Is there a way to change it so that my... (1 Reply)
Hello All,
What would be the equivalent of backspace key in the korn shell.
My scenario is: I am trying to install a product..and it comes out with a Licence Agreement screen, When I manually enter backspace key..I am able to get out of the whole agreement message to a point to type Agree A) or... (2 Replies)
Hi
In solaris if i have to delete something from shell i need to use ctrl+H, coz if i use backspace it shows ^?. Can any one please tell me how to set backspace key so that i can delete any character directly instead of using Ctrl+h.
Second Q is like in linux for going to recent command, i... (10 Replies)
Hi all,
I am using a script which is as follows: It reads a character.
I want to check if the character is a backspace character or some other character.
read -n 1 x
if ; then
echo "backspace detected"
else
echo "some other character"
fi
Thanks in advance. (1 Reply)
Hi gurus, i use vi editor. when I want search something I Type / (or ? if i want search backward), that is OK.
But when i make mistake in searching string how can i delete character ?
I tried bacskpase but did not work (gives just strange characters).
Also tried shift+bacskspace but this only... (3 Replies)
Hi friends,
Hope u r doing well. It is a very strange problem that I've never faced when I used linux or freebsd. When a type a command in Solaris 10, and if I make a mistake, the backspace doesn't work, when I press the backspace key three times forexample, this is what I get, ^H ^H ^H. The same... (2 Replies)
i have something like this
tablesName="abc def hij akn ... etc etc"
count=0
for i in $tablesName
do
echo -en "\b\b\b\b\b\b\b\b\b\b\b\b\bTableCount: $count"
count=`expr $count + 1`
done
the above is just a description wha i need is when the loop executes
the... (1 Reply)
Trying to insert a backspace for echo.
while true ; do
i='-\|/'
for j in 1 2 3 4
do
echo -ne "$(echo ${i} | cut -c${j})"
sleep 1
done
done
this currently outputs:
-\|/-\|/-\|/-\| .....etc
---------- Post updated at 02:34 PM ---------- Previous update was at 02:10 PM... (7 Replies)
Discussion started by: squrcles
7 Replies
LEARN ABOUT REDHAT
col
COL(1) BSD General Commands Manual COL(1)NAME
col -- filter reverse line feeds from input
SYNOPSIS
col [-bfpx] [-l num]
DESCRIPTION
Col filters out reverse (and half reverse) line feeds so the output is in the correct order with only forward and half forward line feeds,
and replaces white-space characters with tabs where possible. This can be useful in processing the output of nroff(1) and tbl(1).
Col reads from standard input and writes to standard output.
The options are as follows:
-b Do not output any backspaces, printing only the last character written to each column position.
-f Forward half line feeds are permitted (``fine'' mode). Normally characters printed on a half line boundary are printed on the follow-
ing line.
-p Force unknown control sequences to be passed through unchanged. Normally, col will filter out any control sequences from the input
other than those recognized and interpreted by itself, which are listed below.
-x Output multiple spaces instead of tabs.
-lnum Buffer at least num lines in memory. By default, 128 lines are buffered.
The control sequences for carriage motion that col understands and their decimal values are listed in the following table:
ESC-7 reverse line feed (escape then 7)
ESC-8 half reverse line feed (escape then 8)
ESC-9 half forward line feed (escape then 9)
backspace moves back one column (8); ignored in the first column
carriage return (13)
newline forward line feed (10); also does carriage return
shift in shift to normal character set (15)
shift out shift to alternate character set (14)
space moves forward one column (32)
tab moves forward to next tab stop (9)
vertical tab reverse line feed (11)
All unrecognized control characters and escape sequences are discarded.
Col keeps track of the character set as characters are read and makes sure the character set is correct when they are output.
If the input attempts to back up to the last flushed line, col will display a warning message.
SEE ALSO expand(1), nroff(1), tbl(1)STANDARDS
The col utility conforms to the Single UNIX Specification, Version 2. The -l option is an extension to the standard.
HISTORY
A col command appeared in Version 6 AT&T UNIX.
BSD June 17, 1991 BSD