Timing task script

#! / bin / the bash 
# task set time, interval The time interval, duration of the long duration 
# may be performed at the console. / Timer. SH & placed in the background, generally temporary log 

interval The = . 3 
DURATION = ` expr  60 \ * 60 \ * 24- ` 

for ((i = 0 ; i <DURATION; i + = interval the)); do 
    # put here to perform tasks 
    echo  " tongyishu " >> ./ timer.log 

    SLEEP $ interval the ;
 DONE