SDBM_File(3) SDBM_File(3)
SDBM_File - Tied access to sdbm files
use SDBM_File; tie(%h, 'SDBM_File', 'Op.dbmx', O_RDWR|O_CREAT, 0640); untie %h;
See the tie entry in the perlfunc manpage PPPPaaaaggggeeee 1111