update bsearch.pl
add a new data structure of address in perl
another bsearch impl in perl
add benchmark deom in perl
fix spell error
add perldoc refer
add a new perl module process
rename process.pm to os.pl
fix indent issue
add dec2bin, dirwalker, etc.
add case HALT
add perltoot, perlobj, perldsc
add close file
add logbase
add upper case
add fibnacci