1. Applications: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z 

h2ph - convert .h C header files to .ph Perl header files
h2xs - convert .h C header files to Perl extensions
hash
head - output the first part of files
HEAD - request, GET, HEAD, POST - Simple WWW user agent
help
hesinfo - find out what is stored in the Hesiod database
hipstopgm - convert a HIPS file into a portable graymap
history
host - DNS lookup utility
hostid - print the numeric identifier for the current host
hostname - show or set the system's host name
hpcdtoppm - convert a Photo-CD file into a portable bitmap file
hpftodit - create font description files for use with groff -Tlj4