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ping 10.0.0.7
telnet 10.0.0.7
curl 10.0.0.7
7*24
sudo chattr +i a.txt
sudo chattr -i a.txt
lsattr a.txt
-c
for i in {1..254};do ping -c2 -W1 172.19.28.$i &>/dev/null && echo "172.19.28.${i} ok";done