/prefix_to_mask.sh
Last active Sep 15, 2018
将前缀长度转换为子网掩码
| #!/bin/bash | |
| # date: 2018-03-03 | |
| # license: GPLv3 https://www.gnu.org/licenses/gpl-3.0.txt | |
| # author: nanpuyue <nanpuyue@gmail.com> https://blog.nanpuyue.com | |
| num=$((4294967296 - 2**(32-$1))) | |
| for i in {3..0};do | |
| echo -n $((num / 256**i)) | |
| num=$((num % 256**i)) | |
| (($i == 0)) && echo || echo -n . | |
| done |
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