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Fix 117.md
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answer/117.md

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### 解答
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```
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$ f(){ ls /sys/bus/usb/drivers/usb | wc -l ;}
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$ n=$(f) ; while sleep 1 ; do m=$(f) ; [ $n -gt $m ] && echo 抜かれました ; [ $n -lt $m ] && echo 挿されました ; n=$m ; done
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```
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### 別解
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```
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```

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