by Kamran Husain

IN THIS CHAPTER

• A Brief Introduction to Browsers

• Getting Navigator for Linux

• Getting Around

• Help!

• Selection of Preferences

• Bookmarks

• Directories Used

• Reading News

• Handling Mail in Navigator

• Where to Get Mosaic for Linux

• Using Mosaic

• The Icons in Navigator and Mosaic

• Setting Up SLIP Connections

This chapter is a brief introduction to Netscape and Mosaic. We will cover the following topics in this chapter:

• How to get and set up Netscape for your Linux machine.

• How to get and set up Mosaic for your Linux machine.

• How to configure a SLIP connection for dialup and dedicated lines using Linux.

To access the services on the Web, you need a browser. A browser is an application that knows how to interpret and display documents it finds on the Web. Documents on the Web are encoded in the Hypertext Markup Language (HTML). Hypertext documents contain special codes that tell the browser how to locate information on the Web. How the browser interprets the codes is left as a local issue. Some browsers, such as Lynx, ignore any requests for inline images; some older Mosaic browsers ignore the interactive forms that a user can fill in while online. Newer versions of Netscape's Navigator are great for handling images, entry forms, animated images, and programs like those in scripting languages such as VBScript and JavaScript.

Any browser you work with must have the following features:

• The capability to display plain text, HTML documents, and audio

• The capability to display inline graphics and images

• A reasonably customizable graphical user interface

• The capability to track previous sites with lists in a History and Hotlist

• The capability to find items via search commands within a document and over the Internet

• Extendibility via third-party software items known as plug-ins

We will cover the Netscape Navigator and, briefly, the Mosaic browser from NCSA. The emphasis in this chapter will be on Netscape because I think it is easier to work with under Linux. If you are a die-hard fan of Mosaic, you will get enough information from this chapter to be able to get and use it.

You need the following items to be able to run Netscape's Navigator on your Linux machine: an Internet connection (serial or direct), about 10MB of disk space, 8MB of RAM or better, and X Window running on your machine. Requirements for disk space might be greater than what I have just quoted here because Navigator uses some disk space for caching its files. More on that in a bit; let's get the program first.

The latest version of the Netscape Navigator, 3.01, is available free from the ftp site at ftp.netscape.com. This is the directory to go to at ftp.netscape.com:

/pub/navigator/3.01/unix/

You might find several versions of the Navigator software for different types of UNIX systems. Get the latest file with the word "linux" in it. You will most likely get the version that applies to "unknown" and "x86."

Use the string "*linux*" in the mget command. It's about 2.33MB in a gzipped file, and it takes a some minutes to download, depending on your connection. Here's an excerpt of a session:

ftp> mget "*linux*"

mget netscape-v301-export.x86-unknown-linux-elf.tar.gz?y

200 PORT command successful.

150 Opening BINARY mode ... <snip> ... (2338294 bytes).

After you get the file, you have to unzip it to get the distribution files, including the README file. I prefer to rename the recently downloaded file to something simple (myn.tar.gaz) to avoid goofy typing mistakes. Here are the commands I used to unzip with the gunzip command and untar the distribution:

$ mv netscape-v301-export.x86-unknown-linux-elf.tar.gz myn.tar.gz

$ gunzip netscape-v301-export.x86-unknown-linux-elf.tar.gz

$ tar -xvf  netscape-v301-export.x86-unknown-linux-elf.tar

It's a good idea to unzip the file in a directory by itself. This way, you know which new files you are dealing with. Unzipping the file reveals a bigger tar file. In the case of Navigator 3.01, the tar file was about 5.5MB, whereas the zipped file was 2.3MB.

This is what the files in the 3.01 distribution look like (no doubt, later versions will have different files, dates, and sizes):

$ ls

total 5385

-r--r--r--   1 khusain  users       12965 Oct 20 21:41 LICENSE

-r--r--r--   1 khusain  users      219640 Oct 20 21:38 Netscape.ad

-r--r--r--   1 khusain  users        9832 Oct 20 21:41 README

-r--r--r--   1 khusain  users        4674 Oct 18  1994 XKeysymDB

-r--r--r--   1 khusain  users      725156 Oct 20 21:41 java_301

-r-xr-xr-x   1 khusain  users        5464 Oct 20 21:33 movemail

drwxr-xr-x   2 khusain  users        1024 Oct 20 21:41 movemail-src

-r-xr-xr-x   1 khusain  users     4505716 Oct 20 21:41 netscape

The movemail-src directory is really not required if you are on a Linux machine or do not plan on using the mail handler in Netscape. Ignore it for now. If you are tempted, get the README file in this directory for your mail handler. Besides this, movemail is freeware and is included in Netscape in case you run into problems locking mail files in Linux.

The directions in the Navigator README file are easy to read and self-explanatory. Just copy the relevant files and binaries in known paths, and you are done.

The file that is very important to consider is the java_301 file with the libraries for the Navigator software. If you are the only person on this machine, great--just run Netscape from the directory into which you just untarred files. If you have more than one user on the Linux machine, copy the java_301 file into one of the directories listed in the README file.

Also, if you are upgrading from a previous version of Netscape Navigator, now is a good time to remove any legacy files from this lib directory:

# rm /usr/local/lib/netscape/*

You have to be logged in as "root" to be able to do this. After cleaning up older files, I chose to copy the file into /usr/local/lib/netscape:

# cp java_301 /usr/local/lib/netscape

A common problem with upgrading Navigator on Linux is that folks often forget to copy the java_301 file to the expected directories. This results in their crashing their newer version of Navigator with the use of an older Java library. Be sure to take this step and have at it.

Finally, if you have any shortcuts in your window manager, you might want to point these locations to the newer version of Navigator. An easier route is to simply remove the old directory and untar in the new version in a new directory with the same name as the old directory. If you are cautious, you can simply rename the old Navigator directory to something else and then untar your files into the directory with the original name. This way, you will preserve any previous links to "navigator."

Now you are ready to go. Type the following command to start the browser:

$ netscape &

The Netscape program took an inordinately long time to start on a DX4 running at 100MHz with 32MB of RAM. You might have a different experience with a faster video card. Maybe. In any event, you are presented with a license agreement as shown in Figure 61.1. You might as well accept this license if you want to use the software. It's not as if you have a choice, and you are not signing your life away. (You can view the license in its entirety in the LICENSE file.)

The main scene when Navigator comes up is shown in Figure 61.1. Clicking anywhere on the window forces the browser to load its default home page. The first thing you will notice when using your new browser is that it defaults the home page to Netscape. If you are not connected to the Internet, this might cause Navigator to wait for a long time. You can easily stop the attempted transfer and set up a local file as the default home page instead.

One of the first things I noticed when I brought up Navigator was that I was missing some fonts. The error messages were a bit annoying at first but were not really a problem. I did, however, have a problem with my .xinitrc file, because I was too stingy in loading fonts when starting X. I resolved the situation by adding the following commands to load every font that I have installed on my system:

xset +fp /usr/lib/X11/fonts/misc

xset +fp /usr/lib/X11/fonts/100dpi

xset +fp /usr/lib/X11/fonts/75dpi

xset +fp /usr/lib/X11/fonts/Speedo

xset +fp /usr/lib/X11/fonts/Type1

The commands took care of "unresolved fonts" warning messages. If you want to change the default appearance of the fonts, you can use the Appearance page in the Options menu. A typical setup is shown in Figure 61.3. Change the font type and so on to your liking; then click OK and you're done.

Ordinarily, you would not have to modify the default MIME types. Most of the default MIME types supported by Navigator will let you get by just fine. If, however, you want to add some default behavior, you might want to consider setting up your own actions for a MIME type.

Alas, the backspace key did not work right in any of the text widget areas when I used Navigator with Linux and X Window. This could be a local problem on my Linux installation, so you might not have this experience. Instead of deleting the character to the left of the cursor, the backspace key deletes the character to the right of the cursor. Using the ever-handy Ctrl-H combination does the trick for me for the most part. But it's irritating as heck to find the backspace working like the old VT-100 keyboard's Delete key.

The quick solution for me was to map the Delete key to the same value as the backspace key with the xmodmap command:

$ xmodmap -e "Delete = BackSpace"

After making this change, fire up Netscape from within this xterm. Now the backspace should work correctly. The sad part is that the Delete key now works like the backspace key. I told you this was a quick solution. I rarely use the Delete key when editing text, so it's not a real problem for me. You, on the other hand, might consider this an affront to programming. All is not lost...so far.

The Help menu lists a searchable list of items on Netscape. You'll find a query and an answer for this very problem that suggests using the loadkeys program. In my humble opinion, the loadkeys program is much too complicated to use for such a simple task. Also, an incorrect use of the loadkeys program can lock up your keyboard and require a power-up. It's up to you as to which version you want to work with.

Each underlined letter in a menu item is a shortcut to the action which that menu item normally takes after the menu is open on your screen. (Again, this shortcut worked on one Linux system and not on another. Your mileage may vary.) You must have first selected a menu for the underlined shortcuts to work.

In Netscape, you can use the Alt key followed by the menu option to get the same result. For example, Alt-N or Alt-n opens a new window, and Alt-F searches for text in the currently viewed document.

The cut and paste features of Navigator do not work very well in Linux. Be careful because sometimes the cut-and-paste operation crashes Navigator. You can select text from the viewing area as though you are in a normal workstation or editor window. Cut and paste into other X Window System windows as usual by pressing the left mouse button to begin selecting text, and then holding down the button and dragging. Alternatively, release the left mouse button and use the right mouse button to complete the selection. See the details about this operation in Netscape's Help.

Speaking of Help, when you click on the Help menu, you can access a Frequently Asked Questions list relating to your type of operating system. Search on the word "Linux" and you should get some answers to basic problems that others have faced with running Linux.

The only catch to this approach is that you must already be hooked up to the Internet to be able to avail this feature. If getting to the Internet is the crux of your problem, you will have to resort to some other venue to get help.

Nevertheless, the help in Netscape's archive is very helpful when you can get to it. If you are using the Linux software from the back of this book, you needn't worry about asking X11R5 questions, because you will be using X11R6. The rest of the answers in the FAQ provide a quick insight on the level of Netscape's support for Linux.

By the way, this is the URL to get help on Navigator directly:

http://help.netscape.com

The preferences you set for your Navigator software will be set in a file in a special directory called .netscape in your home directory. The file with your preferences is appropriately called preferences. Shown here is a list of some of the options in this file:

# Netscape Preferences File

# Version: 3.01

# This is a generated file!  Do not edit.

SHOW_TOOLBAR:  True

SHOW_URL:  True

SHOW_DIRECTORY_BUTTONS: True

SHOW_MENUBAR:  True

SHOW_BOTTOM_STATUS_BAR: True

AUTOLOAD_IMAGES: True

FTP_FILE_INFO:  True

SHOW_SECURITY_BAR: True

TN3270:   xterm -e tn3270 %h

TELNET:   xterm -e telnet %h %p

RLOGIN:   xterm -e rlogin %h

RLOGIN_USER:  xterm -e rlogin %h -l %u

MEMORY_CACHE_SIZE: 3000

DISK_CACHE_SIZE: 5000

CACHE_DIR:  ~/.netscape/cache/

VERIFY_DOCUMENTS: 1

CACHE_SSL_PAGES: False

<<SNIP>> file deliberately cut to save a tree<<SNIP>>

FIXED_MESSAGE_FONT: False

ADD_URLS:

BOOKMARK_MENU:

PRINT_COMMAND:  lpr

PRINT_REVERSED:  False

PRINT_COLOR:  True

PRINT_LANDSCAPE: False

PRINT_PAPER:  0

Heed the caution remark at the start of the file, and don't edit this file unless you absolutely must--for example, if you accidentally overwrite it (a rare but not an impossible thing for a dyslexic touch typist such as me). The preferences file is rather long and is not really meant to be edited by the user. Your selections in the Options menu and dialogs are reflected in the preferences file.

You can specify which types of menus you want to display by turning checkboxes on or off in the Options menu. The location box should usually be kept open because it allows you to directly type the URL of where you want to go. If you would rather have the screen space, you can choose File | Open Location to get the dialog shown in Figure 61.6. Local files can be retrieved via the Open File option.

Your favorite URLs can be saved as bookmarks. When you are at a location you would want to come back to, just select Options | Add Bookmark. All your previous options are listed in the drop-down list shown when you select the Bookmarks option.

The drop-down selection list can be very long and quite unmanageable. Also, items are appended to the end of the list when you add a bookmark. This causes bookmarks of different topics to be interleaved. You can use "folders" to manage your bookmarks for you. A folder simply contains other URLs or folders. Navigator provides an easy way to manage your bookmarks with its Bookmarks window. Choose Window | Bookmarks. You are presented with a floating window from which you can drag and drop entries into folders to create your own custom menus.

The History option on the Windows menu presents you with a window listing the sites you have been to during your session. You can select items in this dialog to add them to your bookmarks file. The bookmarks file can be saved as an HTML file as well.

Navigator uses a .netscape directory in your home directory. This directory includes the current lock files to prevent more than one Navigator application from being used per user at one time. If you try to run Navigator while a lock file is in place, it bails out with an error message. In the case of leftover lock files from a crash or something, all you have to do is remove the lock file and restart Navigator.

The .netscape directory contains several other files. Here is a directory listing of these files:

$ ls -l ~/.netscape/

-rw------    1 khusain  users         296 Nov 29 07:16 address-book.html

-rw------    1 khusain  users       16435 Dec 10 08:04 bookmarks.html

drwx------  34 khusain  users        1024 Oct 13 20:23 cache

-rw------    1 khusain  users        4096 Aug  8 11:46 cert-nameidx.db

-rw------    1 khusain  users       13312 Aug  8 11:46 cert.db

-rw------    1 khusain  users       40960 Dec  9 16:11 cert5.db

-rw------    1 khusain  users         922 Dec 10 08:30 cookies

-rw------    1 khusain  users     1323008 Dec 10 08:30 history.db

-rw------    1 khusain  users       16384 Dec  9 16:11 key.db

lrwxrwxrwx   1 khusain  users          19 Dec 10 07:30 lock -> 204.251.103.1:28668

-rw-r--r--   1 khusain  users         131 Jun 13  1996 mailcap

-rw-r--r--   1 khusain  users         101 Nov 17 10:41 newsgroups Âgenetics.upenn.edu

-rw-r--r--   1 khusain  users      139600 Nov 29 07:07 newsgroups-news.onramp.net

-rw-r--r--   1 khusain  users          21 Dec 10 07:30 plugin-list

-rw-r--r--   1 khusain  users          21 Dec  9 16:15 plugin-list.BAK

-rw-r--r--   1 khusain  users        3506 Dec  9 16:28 preferences

The HTML files are used to track your preferences such as bookmarks and the address book. The lock link is present because I am already running Navigator. The preferences are also listed here.

The cache directory is used to hold HTML files and images so that you do not have to go to your network connection every time you reload a page. Navigator's cache area can take up only a few megabytes. For example, in my machine, the du command revealed that I use about 4.5MB of the cache area. The size of the cache can be set with the dialog presented in the Network Preferences menu option in the Cache tab. See Figure 61.7.

Netscape's Navigator comes with a great news reader. You can start it with the Netscape News command on the Options menu. You are presented with the window shown in Figure 61.8. Your Internet Service Provider should be willing to provide you with a news feed for you to be able to read news. You have to set up the information for the news server yourself. You can get the setup dialog via the Options | Preferences menu item. The dialog for this initial setup for the news reader is shown in Figure 61.9. After you have set up the news server information, you can read the news with the News button. The configured news servers are shown as icons in the pane for the news reader. Double-click the icon for the server and get all the messages for newsgroups on that server. Messages that are received for a newsgroup are displayed by subject, as shown in Figure 61.10. Click on the subject line for each message to read its contents in the bottom pane.

The Navigator program provides for a pretty darn good mail handler in itself. Figure 61.11 shows the default mail handler screen. You have to set up your own personal items for this mail handler to work right. Choose the Options | Mail and News Preferences menu item. You are presented with the dialog shown in Figure 61.12. The options you set up for your mail address are found in the page for the Identity tab.

The latest version is available from the Internet at the ftp site sunsite.unc.edu in the directory /pub/Linux/system/Network/info-systems/www/Mosaic. Several files can be found there, the latest of which was the May 31, 1995, version, Mosaic-linux-2.62b.Z. Get the latest version, if any, for Linux and unzip and untar it in a separate directory. (The 2.72 version was not specifically named as having been built for Linux, and therefore I cannot recommend it at this time.)

After the dust settles from the extraction commands, you have the Mosaic file in your directory. You also have some app-defaults files you can use to customize your copy of Mosaic. As with other X applications, almost all of Mosaic's features can be customized using the Xdefaults file with the Mosaic resource. It's easier, however, to use the application's menus to set the items in the Xdefaults file than to manually edit it. For example, to set the home page, use this line:

Mosaic*HomePage : "http://www.ikra.com"

Alternatively, you can set the WWW_HOME environment variable to the path previously shown. Or you can use the menu items to set the home page. Using the environment variable is more consistent with other UNIX platforms. Using the menus and dialogs is a whole lot easier. The distributions from NCSA include the app-defaults files for each version of Mosaic. After you have installed Mosaic on your machine, edit these files to customize your own files. Read the app-defaults files for all the resources that are available to you for your version of Mosaic.

Now, you can fire up Mosaic from within an xterm with the command Mosaic. (It's probably best to have Mosaic run in the background so that you won't tie up your xterm.) When Mosaic is up, it attempts to load its default hypertext document, called the Home Page. Basically, the Home Page is the first document you start with and the one document that you know you can always load if you get lost while browsing the Web.

Like Navigator, Mosaic lets you keep a history of where you've been. You now have quick access to frequently used documents via two types of personal lists. History lists are valid for a current session only. Hotlists are those lists you want to keep for all future sessions.

The Mosaic Document View screen is where you see all the HTML documents on the Web. The Document View window has six pull-down menus: File, Options, Navigate, Annotate, News, and Help. The main portion of the screen is taken up by the viewing area for the data. Mosaic shows the title of the document and its URL under the menu bar.

In the upper-right corner of the Mosaic screen is a globe superimposed on a stylized S. In Netscape, it's an image of a planet with an N on it. This is the official logo for NCSA Mosaic. This icon serves two purposes in each browser:

• When a hyperlink is activated by a click on the word or image, the globe spins and beams of light travel along the segments of the S toward the globe. This movement signifies that your document is being retrieved. This is analogous to the stars in the Netscape Navigator icon, which shows animated meteorites and stars.

• You can stop a transfer by clicking on the globe icon. The beams of light usually stop when you do this, which in turn indicates that the current transfer has been aborted. In Netscape, clicking the icon warps you to Netscape's home page. You have to use the STOP icon to stop message transfer in Netscape.

The status line in the browser then displays a message. If part of the file was already retrieved without the inline images, the Document View window contains the new document; click the Back button at the bottom of the window to return to the document containing the hyperlink.

The following list discusses some common actions you might take when using a browser:

Back	Returns to the previous document in the Document View window history.
Forward	Returns to the document that preceded the current document. This button is dimmed if you have not moved backward yet.
Home	Moves to your home document or home page.
Reload	Reloads the current document from the server or sometimes the cache.
Open Location	Opens the Open Document window to enter the URL for a file to be viewed.
Open File	Opens the Open Document window to enter the pathname for a file to be viewed.
Save As	Opens the Save Document window that lets you save the current document to your local system in different formats: HTML, Postscript, or text.
Save Frame	Lets you save the contents of a frame rather than an entire window. A frame is a portion of the screen.
New Window	Opens a new Document View window. The content of the new window is your default home page. You can have several instances of browsers running in one session, each pointing to a different URL.
Close Window	Closes the current Document View window. If you have only one window open, the entire application exits. Also available on the File menu.

When removing an extra window, such as an extra Browser window, remember to delete or close the window. If you choose the Destroy option in your window manager, all active sessions are destroyed.

The cursor in Mosaic or Netscape is generally a standard short arrow pointing slightly to the left of 12 o'clock. The cursor changes its configuration depending on where you are in the Document View window. It is the arrow configuration unless it is pointing to a hyperlink. When the cursor rests on a hyperlink, it changes to a small hand icon pointing to the left. When the cursor changes its configuration, the hyperlink's URL is displayed in the information line. This URL tells you what will be retrieved if you select the hyperlink. It also might tell you the format of the document.

This section really belongs in a chapter by itself, but it's here because you are most likely to run into these types of problems when trying to use your browser. Setting up a SLIP connection is necessary if you are not already on the Internet. To get a dialup SLIP connection, you have to use the /sbin/dip program. The dip stands for Dialup Internet Protocol. For a dedicated connection, you should use the slattach program.

If you are already connected to the Internet through another means, skip this section entirely.

The dip program uses a script file to connect you to a SLIP account. You need a SLIP account to use Mosaic or Netscape if you are connected to the Internet with a serial connection. Using dip with a -t option can also let you run in interactive mode for debugging, but in most cases you use it with a script file.

A script file is basically a file that handles your login and setup for you. You invoke /sbin/dip with the script name as an argument. A sample script file to work with my Internet SLIP account is shown in Listing 61.1. Your Internet provider should provide a script for you. If it does not provide a script, ask for one.

Let's look at the sample script file in Listing 61.1.

main:

#

# Get the local and remote names for the network

#

get $remote remote

#

#

#

default

get $mtu 1500

port cua1

speed 38400

modem HAYES

flush

reset

send +++

sleep 1

send ate1v1m1q0\r

wait OK 2

if $errlvl != 0 goto error

send atdt5551212\r

if $errlvl != 0 goto error

# wait CONNECT 60

login:

sleep 3

wait login: 30

if $errlvl != 0 goto error

send johndoe\r

wait ord: 5

send  doa+sol!\r

wait TERM 10

send  dumb\r

wait $ 10

send dslip\r

wait Your 10

#

# get $remote remote

#

get $local remote

#

# Ask for the remote site's IP address interactively from the user

#

get $remote ask

# cannot do this dec $remote

done:

print LOCAL address is $local

print CONNECTED to $remote

print GATEWAY address $remote

default

mode CSLIP

goto exit

error:

        print SLIP to $remote failed

exit:

Listing 61.1 shows how to access an Internet service provider via a dialup SLIP account. This script gives you an example of how to log into the remote system and get your local address, and it even asks you for the remote IP address.

Normally, you run the SLIP script as root. You can set the permissions on the files in /etc/dip for all user access and not have to run as root. For debugging purposes, the -v option echoes all the script lines as they are executed. The echo on and echo off commands in script files turn the echoing on or off while executing. The -v option is like having the echo on command set as the first line in the script file.

The modem command in the scripts for dip supports only the HAYES parameter. You can set the speed with the speed command. For other parameters of your modem, use the Hayes command set. For example, ate1v1m1q0\r sends the accompanying string to the modem to initialize it.

You can send output to the modem (and remote host) with the send command. To wait for a specific string, use the wait command with part of the string you are waiting for. Beware, though, that if the string you are waiting for never appears, you can hang forever. The sleep command simply pauses the shell execution for the specified number of seconds. All variables for dip must be lowercase and preceded with a dollar sign. The dip program recognizes the following special variables:

$remote for remote host name

$rmtip         for remote host IP address

$local for local host name

$locip         for local host IP address

$mtu   contains the MTU value for the connection.

 You get this value from your internet provider.

The get command is dip's way of setting a variable. The following line requests the name of the remote host from the user. The ask parameter tells dip to prompt the user for the input.

get $remote ask

The local address for this script is derived when you log into your service provider. The remote host prints a string of the form Your IP address is zzz.yyy.xxx.www. So the script waits for the Your string and then gets the last word on the line. Some SLIP service providers assign you a different address every time you log in, so you have to do this. The way to do this is as follows:

#

# Get local address from this string.

#

wait Your 10

get $local remote

The default command tells dip to route all default message traffic points to the SLIP link. The default command should be executed just before the mode command.

The mode command recognizes either SLIP or CSLIP as a parameter. CSLIP is the compressed SLIP mode. If all goes well, the dip program goes into daemon mode. The dip program executes the ifconfig program to automatically configure your interface as a point-to-point link.

Finally, to kill an existing dip process, you can use /sbin/dip with the -k option. You should do this when you turn off your machine or log out to free up your phone line.

The slattach file is used to connect on a dedicated line to a remote server. If your modem is on /dev/cua2, the command to configure a CSLIP connection is run as root:

# slattach /dev/cua2 &

You can put this in your rc.inet files if you like. If your service provider does not support CSLIP, you can use the -p slip option to get the uncompressed SLIP mode. Just make sure that you run the same mode as your service provider.

Then, you execute the following commands:

# ifconfig sl0 localhost pointtopoint myrichISP

# route add myrichISP

# route add default gw myrichISP

The first command connects you as a point-to-point to a SLIP connection. (The sl0 is s ell zero.) The next two commands add the node myrichISP (the Internet service provider) as the default route.

To kill this connection, you must issue the following commands:

# route del default

# route del myrichISP

# ifconfig sl0 down

# kill -9 (slAttachPID)

In this case, slAttachPID is the process ID of the slattach process.

If you can use Netscape, you can use just about any other browser. All browsers are based on the same basic principles of retrieving and displaying a file by checking the type of data in it. After you know how to navigate using URLs, surfing the Net becomes a task of learning how to use the special keys for your browser to help you customize its functions to best suit your needs.

The following items were covered in this chapter:

• Where to get Netscape for Linux, which versions to use, and how to debug common problems in Mosaic.

• How to install Netscape on your machine after you get the distribution via FTP.

• What alternatives you have to Netscape as far as browsers are concerned: Mosaic or Lynx, to name two.

• A brief introduction to connecting your Linux node via SLIP to an Internet service provider.