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Carriage return ksh

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# 1  
Old 01-10-2012
Tools Carriage return ksh
Hello,

How do i usecarriage return in ksh.
I want to do an echo "bla bla" and another echo "bla bla" will appear and replace the first echo on screen.

I tried:
Code:
until [ -z "$answer" ]; do
   echo "bla bla \r"
done

please advice.

Thanks.
Last edited by methyl; 01-10-2012 at 09:37 AM.. Reason: repaired code tags
# 2  
Old 01-10-2012
In GNU Bash:

Code:
man echo
.
.
-e     enable interpretation of backslash escapes
.
.
\r     carriage return

This User Gave Thanks to balajesuri For This Post:
LiorAmitai
# 3  
Old 01-10-2012
Since the OP asked, how to do it in ksh - here is, how to do it using the printf command or builtin (in ksh93):

Code:
printf "bla bla\r"

BTW: I really try to avoid using echo, because there are so many different implementations around, that it is a pain in the *** to write portable scripts.
This User Gave Thanks to hergp For This Post:
LiorAmitai
# 4  
Old 01-10-2012
Your original script does nothing because the "while" condition happens immediately. Suggest you have a "sleep" command in the script or you will kill your network.

Code:
#!/bin/ksh
while true
do
   echo "bla bla \r\c"
   sleep 1
done

Stop the script with SIGINT (usually ctrl/c).
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