Utilities are programs that can run or execute. Commands are slightly different than utilities. Command refers to the name of the program and any arguments you specify to that program to change its behavior.

Ifconfig

There are too many to list here. Try looking on Amazon for Unix Security and you will receive a large list of them.

Depends on what you mean by a "gnu" file, since utilities are common across Unix platforms including HPUX. Need more information.

Kernel (internal/privileged)

Kernel API

Low-level system libraries

System utilities

Application-level libraries

User utilities/applications

.............................................by nc paul