09-16-2007
Scheduler program
Hi,
what i need to do is build my own scheduler program.
I am supposed to display my own prompt. at this prompt i accept a command in the following format.
ls -l start 0:0:10:10 period 10 end 0:0:0:10
now this command should be executed in the background starting at 10 mins and 10 secs and should repeat and fork another ls -l after every 10 seconds since the period is of 10 secs. every ls -l should complete in the end time 10 secs or should be killed. ALL this is to be done in the background.
so my question is how do I start a process in the background from another process and keep it continuing till i end time expires. I also want to return to the foreground immediately after execution of each command. as in
1) $ ls -l start ... (i hit enter and command is thrown in background and keeps executing )
2) $ ps -ef (i am back to the prompt again and ready to accept a new command)
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LEARN ABOUT DEBIAN
ticker
NAME(1) General Commands Manual NAME(1)
NAME
ticker - scroll messages across the screen
SYNOPSIS
ticker [options] [message]
DESCRIPTION
ticker is a program that continually scrolls a given message across the screen. There is also an interface to allow other programs to
change the message.
KEYS
+, [up arrow]
Increase scroll speed.
-, [down arrw]
Decrease scroll speed.
[space]
Pause. Press any key to unpause.
OPTIONS
-h, --help
Show summary of options.
-u, --upper
Scroll text on the top line of the screen. (Default)
-l, --lower
Scroll text on the bottom line of the screen.
-fcolor, --foreground=color
Use the specified color as the forground color of the text that is scrolled. The colors that may be used are:
black gray
red brightred
green brightgreen
brown yellow
blue brightblue
magenta brightmagenta
cyan brightcyan
lightgray white
-bcolor, --background=color
Use the specified color as the background color of the text that is scrolled. On most terminals, the background color can only be
one of the colors listed in the first column above.
-dsecs, --delay=secs
Number of seconds delay between updates of the display. This controls how fast the text scrolls. You may use decimals to specify
faster scroll speeds. The default delay is 1 second; I find 0.1 more pleasing.
-snum, --sysv=num
Read messages to display from the sysv shared memory segment with an id of num. This is only for use by other programs that need to
be able to change the text ticker displays.
-Snum, --size=num
Size of the shared memory segment to read, when using shared memory communication with another program. Default is 80 characters.
-csecs, --check=secs
Minimum time between checks of the shared memory segment for a new message. Default is every second. It may in fact check consider-
ably less often, as it only checks for a new message once per time that the current message scrolls around the screen.
message
The message to scroll. Required unless -s is used, in which case it is optional.
NOTES
To use the other 23 or so lines of your screen for something useful while the ticker is running, you might want to use splitvt(1)
AUTHOR
Joey Hess <joey@kitenet.net>
NAME(1)