Multithreading to determine whether a user is online (running ping scripts in the background)

#!/bin/bash#writen by jerryfor i in $ (seq 1 255);   do      {        ping 192.168.51. $i  -c  2 >> /dev/null 2>&1     #无论ping到ping不到都不在前台显示          tai=$ (echo $?)         if [  $tai  == 0 ];             then                 echo -e  "\033[1;32m 192.168.51. $i  is  online \033[0m "     #加重颜色显示online              else                 echo -e  "\033[1;35m 192.168.51. $i  is offline \033[0m "     #同上         fi         }&   done    wait     echo  "all finished!"

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Multithreading to determine whether a user is online (running ping scripts in the background)