CodeIQ q1169『Restricted Base32』( http://bit.ly/1xiHTFC )解答例

decode_base32.sh

#!/bin/bash
cat -            |
tr a-z A-Z       |
tr -cd A-Z2-7    |
tr A-Z2-7 0-9A-V |
fold -w1         |
sed \$s/$/\\\n/  |
while read _32; do echo $((32#$_32)); done       |
while read _10; do echo obase=2\;$_10 | bc; done |
sed s/^/0000/g                 |
sed s/^.*\\\(.....\\\)$/\\\1/g |
tr -d \\n                      |
fold -w8                       |
grep -v ^0\\\{1,7\\\}$         |
while read _2; do printf \\x$(echo obase=16\;$((2#$_2)) | bc); done