blob: c72f41eba6562c74316a478ffb1df132e046b8a5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
#!/bin/sh
offset=${1:-13}
if [ "$offset" -lt 1 ]; then
echo "offset must be greater than zero" >&2
exit 1
elif [ "$offset" -gt 25 ]; then
echo "offset must be less than 26" >&2
exit 1
fi
alphabet=aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ
sub1=$(echo "$alphabet" | cut -c $((offset * 2 + 1))-)
sub2=$(echo "$alphabet" | cut -c 1-$((offset * 2)))
sub=$sub1$sub2
tr "$alphabet" "$sub"
|
