Shellscript to help with the distfiles information

"distfile_info" command create following files. 
DIST_MD5:       All distfiles required from pkgsrc/*/*/files/md5
DIST_DISTFILES: All distfiles required from ${_CKSUMFILES}
DIST_ALL:       All distfiles required from pkgsrc
DIST_EXIST:     Real existing distfiles in pkgsrc/distfiles directory
DIST_CORRECT:   Real existing distfiles with correct md5
DIST_BROKEN:    Real existing distfiles with incorrect md5
DIST_NEED:      Real existing distfiles required from md5 or ${_CKSUMFILES}
DIST_UNKNOWN:   Unusable distfiles in pkgsrc/distfiles directory

#DIST_ALL = (DIST_MD5 .OR. DIST_DISTFILES) = DIST_NEED + DIST_UNKNOWN
#(DIST_EXIST .AND. DIST_MD5) = DIST_CORRECT + DIST_BROKEN

If you wanted to remove unusable distfiles, followed command would be done.
# cat DIST_UNKNOWN | xargs -n 1 rm -f 
# cat DIST_BROKEN | xargs -n 1 rm -f