Very Computer

Dear all,

Recently I have a idea to display a real time clock at
the right bottom conner of my screen. (just like win95
little clock).

my idea is that, I can use `date` to form a while loop and
every time it display at the same line.

The Question is:
How can I control the output at the same location every
time and not affect other fount ground program?

I am using Linux and bash.

Thank You!

If you update this every second, you may find that the screen will
flicker too much for it to be in any way useful. I'd go for only
updating it every minute.

Quote:> my idea is that, I can use `date` to form a while loop and
> every time it display at the same line.

> The Question is:
> How can I control the output at the same location every
> time and not affect other fount ground program?

> I am using Linux and bash.

man tput

e.g. to place the cursor at position row 3 column 4, do:

tput cup 3 4

Cheers,

Dave :-)

This works in ksh, you might try it in bash.
clock_p () {
PS1='${__[(H=SECONDS/3600%24)==(M=SECONDS/60%60)==(S=SECONDS%60)]-$H:$M:$S}>'
typeset -Z2 H M S; let SECONDS=`date '+(%H*60+%M)*60+%S'`

Quote:}

call this function and your prompt changes to a clock.

Dale

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Printing ansi control chars also can work.  I know with these
ansi control chars, you can save and restore your cursor position.
this is nice to goto the postion, change the date, and return the
cursor to the origional position so the user doesn't get messed
up with the cursor jumping around.  Below is an example of the
single echo that could do the whole thing.  The \033 is the octal
representation of the ESC key.

echo "\033[s\033[24;50H$(date)\033[u\c"
     Save   move to  print  restore
     curs   row 24   date   curs
            col 50

Here is a simple script to show it working.

#!/bin/ksh
echo Hello
printf "Prompt Location: "
for i in 1 2 3 4
do
  echo "\033[s\033[20;50H$(date)\033[u\c"
  sleep 1
done

echo "STILL AT PROMPT"
# END KSH

 - Matt

Also, man terminfo.

Quote:>e.g. to place the cursor at position row 3 column 4, do:

>tput cup 3 4

In order to return the cursor back to where it was before the
cup, you also need to know about the "sc" and "rc" capabilities.

More problemmatic, however, is how to ensure that the output of
this little function and the output of the "foreground process"
are not interleaved.  You can minimize the race condition by
having the clock code prepare a single string which it blats
out to the terminal (rather than doing its screen update piecemeal),
but even then you'll be subject to the occasional garbled display.

                --Ken Pizzini

   >Dear all,
   >Recently I have a idea to display a real time clock at
   >the right bottom conner of my screen. (just like win95
   >little clock).
   >my idea is that, I can use `date` to form a while loop and
   >every time it display at the same line.
   >The Question is:
   >How can I control the output at the same location every
   >time and not affect other fount ground program?
   >I am using Linux and bash.
   >Thank You!
If you are in X, you can use xclock.  In text mode I don't think there is
a practical way to do this while other programs are running.

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