#command cdx binsearch -H f:1 -k foo -C 1.2,2.1 ccc $TMP/foo.txt
#infile foo.txt
 CDX	foo
aaa
bbb
ccc
ccc
ddd
eee
fff
#stdout
 CDX	f	foo
foo.txt	bbb
foo.txt	ccc
foo.txt	ccc
foo.txt	ddd
foo.txt	eee