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Useful shell commands
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| # 在执行程序10秒后终止 | |
| ping 192.168.1.1 & read -t 10 || kill $! | |
| ping 192.168.1.1 & sleep 10s; kill $! | |
| # 计算 pi 2000 位 | |
| perl -Mbignum=bpi -wle "print bpi(2000)" |
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