21 lines
400 B
Bash
21 lines
400 B
Bash
mask2cidr() {
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local netmask=$1
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local nbits=0
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IFS=.
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for dec in "$netmask"; do
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case $dec in
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255) let nbits+=8;;
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254) let nbits+=7;;
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252) let nbits+=6;;
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248) let nbits+=5;;
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240) let nbits+=4;;
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224) let nbits+=3;;
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192) let nbits+=2;;
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128) let nbits+=1;;
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0);;
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*) die "Error: $dec is not recognised"
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esac
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done
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echo "$nbits"
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}
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