bash useful commands

Ping all devices

• 
  for i in $(eval echo {1..254}); do ping -c 1 -w 1 192.168.1.$i >/dev/null && echo “192.168.1.$i is up”; done

for i in $(eval echo {1..254}); do ping -c 1 -w 1 192.168.1.$i >/dev/null && echo "192.168.1.$i is up"; done

for i in $(eval echo {1..254}); do ping -c 1 -w 1 192.168.1.$i >/dev/null && echo "192.168.1.$i is up"; done