But, i need to display this "hi" in same place in screen(console output)
output must be:
r5c1c2c3c4c5c6
................h i (when i press ctrl+c to terminate infinite loop)
In short, i want to overwrite "hi".
Thanks & Regards
Venkat Gopu
The \r character will send the cursor back to the beginning of the line without moving it down. (It doesn't clear the line, either.) If you're being given instructions to go a specific line though, this isn't sufficient, since printf can't go anywhere but across or down. You need to somehow tell the terminal what to do. You do this with ANSI escape sequences, which means printing the ESC character followed by a little bit of data. Here's two simple ones.
This isn't guaranteed to work in all terminals in all circumstances. (I can't think of a modern UNIX terminal it won't work in, but Windows certainly won't like it.)
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hi
frnds i need help on linux programming as well as how to configure linux.
if u feel free than plz forward me the mail so that i can go through.
email removed
thanx
regards
:)
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LEARN ABOUT CENTOS
col
COL(1) User Commands COL(1)NAME
col - filter reverse line feeds from input
SYNOPSIS
col [options]
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.
OPTIONS -b, --no-backspaces
Do not output any backspaces, printing only the last character written to each column position.
-f, --fine
Forward half line feeds are permitted fine mode. Normally characters printed on a half-line boundary are printed on the following
line.
-p, --pass
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.
-h, --tabs
Output tabs instead of multiple spaces.
-x, --spaces
Output multiple spaces instead of tabs.
-l, --lines number
Buffer at least number lines in memory. By default, 128 lines are buffered.
-V, --version
Output version information and exit.
-H, --help
Output help and exit.
NOTES
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
newline forward line feed (10); also does carriage return
carriage return (13)
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.
AVAILABILITY
The col command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
linux/>.
util-linux September 2011 COL(1)