Fedora Linux

There isn't any! Linux does not make any distinction between categories of programs.

4.1.3.6. ...using a different shell?

Fedora offers four different command shells: csh (a.k.a. tcsh ), bash (a.k.a. sh ), ksh , and zsh . You can temporarily start a different shell just by typing the shell name:

$ csh

Press Ctrl-D or type exit to return to the original shell. You can permanently change your default shell using the chsh (change shell) command:

$ chsh
Password:
bigsecret
New shell [/bin/bash]:
/bin/csh
Shell changed.

The password requested is your normal login password; the change will take effect the next time you log in.

chsh requires that you enter the full pathname of the new shell. To see a list of available shells, use chsh with the -l (list) option:

$ chsh -l
/bin/sh
/bin/bash
/sbin/nologin
/bin/ksh
/bin/tcsh
/bin/csh
/bin/zsh

zsh , ksh , and bash each use a syntax related to the original Bourne shell ( sh ). csh uses a very different syntax, which C programmers often find comfortable.

4.1.4. Where Can I Learn More?

? The bash , chsh , csh , zsh , and ash manpages

4.2. Accessing Online Documentation

A fully loaded Fedora system includes over 4,700 programs, plus programming interfaces, data files, and graphical tools. To help you learn your way around, over 12,000 files of online documentation are available, with additional documentation available through the Web. Knowing how to access and knowledgeably navigate through this documentation is essential to getting the most out of your Fedora system.

The phrase online documentation refers to both local and Internet-based electronic documentation.

4.2.1. How Do I Do That?

There are five main types of documentation available:

? Manpages

? info pages

? The GNOME Guides and KDE Manuals

? HOWTOs and guides from the Linux Documentation Project

? Text files distributed with applications

4.2.1.1. Using manpages

Fedora continues the Unix tradition of providing an online version of what were originally loose-leaf printed manuals. These manuals cover the commands, programming interfaces, and data formats used by the system.

The command used to access these online manuals is called man , so these documents have come to be known as manpages . The majority of Fedora documentation is in this format.

The pages are arranged into sections according to the original binders, using the section numbers described in Table 4-2 . The section numbers are used to distinguish different manpages with the same name, such as the manpage for the uname system call (found in section 2) and the uname command (found in section 1). In some cases, a letter or two may be appended to a section number to indicate a subsection (such as 3pm , the manual section containing Perl module library functions).

A system call is a request made of the operating system by an application program. 

Table 4-2. Section numbers for manpages

Section	Description