halt (8) - stop the system
hdparm (8) - get/set hard disk parameters
hdparm (rpm) - A utility for displaying and/or setting hard disk parameters.
head (1) - output the first part of files
head (1p) - copy the first part of files
hexdump (1) - ascii, decimal, hexadecimal, octal dump
host (1) - DNS lookup utility
host.conf [host] (5) - resolver configuration file
hostid (1) - print the numeric identifier for the current host
hostname (1) - show or set the system's host name
htdigest (1) - manage user files for digest authentication
hwclock (8) - query and set the hardware clock (RTC)
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