sh-2.02$ grep zx /usr/share/dict/words
sh-2.02$ grep zy /usr/share/dict/words
breezy
bronzy
buzzy
chintzy
cozy
crazy
dizzy
enzymatic
enzyme
enzymology
frenzy
frizzy
frowzy
fuzzy
gauzy
hazy
heterozygous
homozygous
jazzy
lazy
lazybones
sleazy
snazzy
syzygy
tizzy
wheezy
zygote
sh-2.02$ grep zy$ /usr/dict/words
breezy
bronzy
buzzy
chintzy
cozy
crazy
dizzy
frenzy
frizzy
frowzy
fuzzy
gauzy
hazy
jazzy
lazy
sleazy
snazzy
tizzy
wheezy
sh-2.02$ grep ^b.*zy /usr/dict/words
breezy
bronzy
buzzy
sh-2.02$ grep ^[aeious].*zy /usr/dict/words
enzymatic
enzyme
enzymology
sleazy
snazzy
syzygy
sh-2.02$ vowel=[aeiou]
sh-2.02$ grep ^$vowel.*zy /usr/dict/words
enzymatic
enzyme
enzymology
sh-2.02$ constant=[a-z]
sh-2.02$ grep ^$constant.*zy /usr/dict/words
breezy
bronzy
buzzy
chintzy
cozy
crazy
dizzy
enzymatic
enzyme
enzymology
frenzy
frizzy
frowzy
fuzzy
gauzy
hazy
heterozygous
homozygous
jazzy
lazy
lazybones
sleazy
snazzy
syzygy
tizzy
wheezy
sh-2.02$ grep ^z.*$vowel$ /usr/dict/words
zebra
zero
zeta
zinnia
zombie
zone
zoo
zucchini
zygote
sh-2.02$ w= /usr/dict/words
sh: /usr/dict/words: Permission denied
sh-2.02$ w=/usr/dict/words
sh-2.02$ echo w
w
sh-2.02$ echo $w
/usr/dict/words
sh-2.02$ grep ^z.*z$ $w
sh-2.02$ grep ^y.*y$ $w
yeasty
yeomanry
yesterday