#command cdx binsearch -ktwo ccc $TMP/foo.txt $TMP/bar.txt
#infile foo.txt
CDX one two three
stuff aaa aaa
junk bbb zzz
things ccc aaa
aaa ccc zzz
zzz ddd aaa
aaa eee zzz
#infile bar.txt
CDX one two three
stuff aaa aaa
junk bbb zzz
111 ccc 222
333 ccc 444
zzz ddd aaa
aaa eee zzz
#stdout
CDX one two three
things ccc aaa
aaa ccc zzz
111 ccc 222
333 ccc 444