For example:
ls to find one or more man pages for
ls.
stat(2) for the system call stat.
a2p(1) - Awk to Perl translator a2p5(1) - Awk to Perl5 translator h2ph(1) - convert .h C header files to .ph Perl header files perl(1) - Practical Extraction and Report Language s2p(1) - Sed to Perl translator s2p5(1) - Sed to Perl translator