22 lines
434 B
Plaintext
22 lines
434 B
Plaintext
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#!/bin/bash
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cidr2mask() {
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local i mask=""
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local full_octets=$(($1 / 8))
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local partial_octet=$(($1 % 8))
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for ((i = 0; i < 4; i += 1)); do
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if [ $i -lt $full_octets ]; then
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mask+=255
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elif [ $i -eq $full_octets ]; then
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mask+=$((256 - 2 ** (8 - partial_octet)))
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else
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mask+=0
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fi
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test $i -lt 3 && mask+=.
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done
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echo $mask
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}
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cidr2mask "$@"
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