Among the topics presented in this section are:

Standards

The POSIX (IEEE) Standards and the X/Open Specifications are described on the standards page.

Environments

The user environment (environ), the subset of the user environment that depends on language and cultural conventions (locale), the large file compilation environment (lfcompile), and the transitional compilation environment (lfcompile64) are described.

Macros

The macros to format Reference Manual pages (man and mansun) as well as other text format macros (me, mm, and ms) are described.

Characters

Tables of character sets (ascii, charmap, eqnchar, and iconv), file format notation (formats), file name pattern matching (fnmatch), and regular expressions (regex and regexp) are presented.

FNS

Topics concerning the Federated Naming Service (fns, fns_initial_context, fns_policies, and fns_references) are discussed.