Is it possible??

Shell Programming and Scripting
1

I have following script..

which print date on screen continuously..
i start it on command line..
once its started it will go on...

IS THERE ANY WAY TO SEND TO TO BACKGROUND ONCE ITS STARTED???

thanks,
vidya...

2

Because you have the date command which wants to write to stdout, without redirecting the date command you will get a SIGTTOU.

What are you trying to do? make some kind TSR program that shows time?

3

You can cheat and create a screen (GNU screen) before starting the script and then detaching from the screen: Ctrl-A, d.

4

You also really should put a "sleep 1" in the loop, as executing the date program non-stop like that will eat up your CPU cycles like crazy.

No point in printing the time zillions of times every second.

If all you want is a digital display of the current time, consider using xclock like so: xclock -digital -update 1 &

5

guys guys..
it was just a example..

6

yes, its definitely possible

switching process between background and foreground is definitely possible

7

how??

8

press ctrl + z, it will pause the program... then fire command 'bg'
it will start the program agin in background.
to see program running in background fire commands jobs ,
to bring back the program in foreground fire command fg.
man pages can tell you more on this .. how to bring specific program to for ground .

9

while :
do
date &
done

10

man bg

11

when any process is running stop the process by pressing ^z (ctrl+z). then it gives the job no.
then u can switch it to back ground by typing command bg %job_number (ex: bg %1)
if u want to get it back to foreground type fg %1.
try this...