#command cdx cgrep -p two,,foo $TMP/one $TMP/two
#infile one
CDX one two three
aaa bbb ccc
111 2foo2 333
qqq www eee
#infile two
CDX one two three
zzz zfooz zzz
aaa bbb ccc
qqq www eee
yyy foo yyy
#stdout
CDX one two three
111 2foo2 333
zzz zfooz zzz
yyy foo yyy