linux shell script delay

 

linux shell script delay 

or the use of sleep or usleep function. 

Details are as follows:     

. 1 , SLEEP: default seconds. 
sleep 1s represents a one second delay   
sleep 1m represents a one minute delay   
sleep 1h represents a one hour delay   
sleep 1d represents a day of delay     
  

2 , usleep: default to microsecond.  
1S = 1000ms = 1000000us