10 lines
315 B
Bash
10 lines
315 B
Bash
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net_netmask_to_prefix() {(
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binaryNetmask=$(echo $1 | sed 's/^/obase=2;/;s/\./;/g' | bc | tr -d \\n)
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binaryPrefix=$(echo $binaryNetmask | sed -n 's/^\(1*\)0*$/\1/p')
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if ! echo $binaryPrefix | grep -q .; then
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echo $0: bad netmask: $netmask >&2
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exit 4
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fi
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printf %s $binaryPrefix | tr -d 0 | wc -c
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)}
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