#command cdx sort -u
#stdin
aaa
bbb
ccc
ddd
aaa
bbb
ccc
ddd
aaa
bbb
ccc
ddd
aaa
bbb
ccc
ddd
aaa
bbb
ccc
ddd
aaa
bbb
ccc
ddd
aaa
bbb
ccc
ddd
#stdout
aaa
bbb
ccc
ddd