Subsections
- alarm
- BEGIN, END
- chdir, $ENV{PWD}
- chomp
- chr, ord, character conversion
- doty
- eval
- getpwuid
- grep
- isatty
- join
- length
- localtime
- map
- mkdir
- pack, unpack
- print, sprintf
- rand, srand
- rename
- require
- socket, connect, fcntl, select,
- sort
- sotd
- split
- stat, localtime
- substr
- System
- time
- times
- uc, lc, ucfirst, lcfirst, case conversion
- unlink
- Numeric functions
