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