8 replies to this topic

[ims]

Does exist some as cron, but for 10-30sec on box ? Cron is for t > 1minute. I want not create plugin, it is for e1.

[betacentauri]

Execute a script every minute and in the script do
execute
sleep 20 secs
execute
sleep 20 secs
execute

[ims]

With sleep ? Will not be some problem with it ?

 

Then could be some as ?:

while [ true ]; do
 sleep 20
 # here put what I want run
done

[MiLo]

Indeed. Just remove the "[", otherwise you'll get syntax errors.:

while true; do
 sleep 20
 # here put what I want run
done

[Erik Slagter]

Or use while [ 1 ] instead. Depends on whether [ and/or true is a shell builtin to select which to use ;)

[MiLo]

When "true" isn't built-in, I doubt that "test" will be...

The "[" is just an alias for "test".

AFAIK, even on busybox both are built-in.

[ims]

will not be problem with sleep (cca 20s) in loop there on E1 with single core ? Would not be better make it with sleep 1
 in some loop for delay ?

 

for a in 1 2 3 4 5 6 7 8 9 10 ...

do

   sleep 1

done

[Erik Slagter]

No don't do that. Make the sleep as long as possible. The sleep command maps 1:1 to a kernel call (probably pause()+alarm()) and the Linux kernel can deal very efficiently with processes in such "suspended" states. It just won't run for the specified amount of time. The only thing is that will have to be checked by the scheduler frequently, but the scheduler will have to do that for about 100 other processes and threads anyway, so it won't really matter.

[ozzsurf]

this works a treat

edit to suit

/usr/script/15sec.sh
 

#!/bin/bash
#This script run every 15 seconds

while (sleep 15 && touch abc.txt) &
do
wait $!
done

start the script  via softcam

/etc/init.d/softcam.15sec

 

#!/bin/sh

case "$1" in
start)
ulimit -s 512
exec start-stop-daemon -S -x /usr/script/15sec.sh &
;;
stop)
exec start-stop-daemon -K -R 2 -x /usr/script/15sec.sh &
sleep 2
killall -9 15sec.sh 2>/dev/null
sleep 2
rm -rf /tmp/15sec.sh
;;
restart|reload)
$0 stop
sleep 1
$0 start
;;
version)
echo "15sec"
;;
info)
echo "15sec.sh"
;;
*)
echo "Usage: $0 start|stop|restart"
exit 1
;;
esac
exit 0