#!/bin/bash

#1.)
#a)
ls -d -- /usr/share/gtk*/
#b)
ls -d -- /usr/share/*[0-9]*[0-9]*/
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#2.)
#a)
grep -E ^.*[0-9]+.*$ /usr/share/dict/words
#b)
grep -E ^i.*[A-Z]+.*$ /usr/share/dict/words
#c)
grep -E  '^[^aeiouAEIOU]*$' /usr/share/dict/words
#d)
grep -cE ^.*[aeiouAEIOU]+[aeiouAEIOU]+.*$ /usr/share/dict/words
#e)
grep -cE '^.*ening$' /usr/share/dict/words
#f)
grep -c "'s$" /usr/share/dict/words
#g)
grep -c "[A-Z]$" /usr/share/dict/words

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#3.)
#a)
sed "s/'s$/s/" /usr/share/dict/words
#b)
sed "s/.*word.*/word/" /usr/share/dict/words
#c)
grep "^[A-Z]" /usr/share/dict/words | sed -e 's/^./\l&/;s/.$/\u&/'