#command cdx cut -f two $TMP/aaa $TMP/bbb
#infile aaa
 CDX	one	two	three
aaa	bbb	ccc
ddd	eee	fff
ggg	hhh	iii
#infile bbb
 CDX	zero	one	two
jjj	kkk	lll
mmm	nnn	ooo
ppp	qqq	rrr
#stdout
 CDX	two
bbb
eee
hhh
lll
ooo
rrr