Logging in and Getting Out
Log in (when you see login:) as a user you created during
installation or as root. (Your FreeBSD installation will already
have an account for root; root can go anywhere and do anything,
including deleting essential files, so be careful!)
To log out (and get a new login prompt) type
exit
as often as necessary. Yes, press enter after commands, and remember
that Unix is case-sensitive—exit, not EXIT.
To shut down the machine type:
/sbin/shutdown -h now
Or to reboot type
/sbin/shutdown -r now
or
/sbin/reboot
You can also reboot with
Ctrl-Alt-Delete. Give it a little time to do its work. This is
equivalent to /sbin/reboot in recent releases of FreeBSD, and is
much, much better than hitting the reset button. You don't want to
have to reinstall this thing, do you?
Adding A User with Root Privileges
If you didn't create any users when you installed the system and
are thus logged in as root, you should probably create a user now with
adduser
Don't use the -verbose option; the defaults are what you
want. Suppose you create a user jack with full name
Jack Benimble. Give jack a password if security (even
kids around who might pound on the keyboard) is an issue. When
it asks you if you want to invite jack into other groups, type
wheel
This will make it possible to log in as jack and use the su command to
become root. Then you won't get scolded any more for logging in as
root, and as root you'll have the same environment as jack
(this is good).
You can quit adduser any time by typing Ctrl-C, and at the end
you'll have a chance to approve your new user or simply type n for no.
You might want to create a second newuser (jill?) so that when you edit
jack's login files, you'll have a hot spare in case something goes wrong.
Once you've done this, use exit to get back to a login prompt and log
in as jack. In general, it's a good idea to do as
much work as possible as an ordinary user who doesn't have the
power—and risk—of root.
If you already created a user and you want the user to be able to su
to root, you can log in as root and edit the file /etc/group, adding
jack to the first line (the group wheel). But first you need to
practice vi, the text editor.
Looking Around
Logged in as an ordinary user, look around and try out some commands that
will access the sources of help and information within FreeBSD.
Here are some commands and what they do:
id/ Tells you who you are!
pwd/ Shows you where you are—the current
working directory.
ls/ Lists the files in the current directory.
ls -F/ Lists the files in the current directory
with a * after
executables, a / after directories, and an @ after symbolic
links.
ls -l/ Lists the files in long format—size,
date, permissions.
ls -a/ Lists hidden (unless you're root) ``dot''
files with the others.
cd/ Changes directories. cd .. backs up
one level; note the
space after cd. cd /usr/local
goes there. cd ~ goes to
the home directory of the person logged in—e.g.,
/usr/home/jack. Try cd /cdrom,
and then ls, to find out
if your CDROM is mounted and working.
view filename/
Lets you look at a file (named filename
without changing
it. Try view /etc/fstab. :q to quit.
cat filename/
Displays filename on screen. If it's too long and you
can see only the end of it, press ScrollLock and use
the up-arrow to move backward; you can
use ScrollLock with
man pages too. Press ScrollLock again
to quit scrolling.
You might want to try cat on some of the
dot files in your
home directory—cat .cshrc, cat .login,
cat .profile.
You'll notice aliases in .cshrc
for some of the ls commands (they're very convenient). You can create
other aliases by editing .cshrc. You can make these aliases
available to all users on the system by putting them in the system-wide
csh configuration file, /etc/csh.cshrc.
Getting Help and Information
Here are some useful sources of help. ``text'' stands for something of
your choice that you type in—usually a command or filename.
apropos text/
Everything containing string text
in the whatis database.
man text/
The man page for text.
The major source of documentation
for Un*x systems. man ls will tell you
all the ways to
use the ls command. Press Enter to
move through text, Ctrl-b
to go back a page, Ctrl-f to go forward,
q or Ctrl-c to quit.
which text/
Tells you where in the user's path the command
text is found.
locate text/
All the paths where the string text is found.
whatis text/
Tells you what the command text does and its man page.
whereis text/
Finds the file text, giving its full path.
You might want to try using whatis on some common useful
commands like cat, more, grep,
mv, find, tar, chmod,
chown, date, and script.
more lets you read a page at a time as it does in DOS,
e.g., ls -l | more or more filename. The
* works as a wildcard—e.g., ls w* will show
you files beginning with w.
Are some of these not working very well? Both locate
and whatis depend on a database that's rebuilt weekly.
If your machine isn't going to be left on over the weekend (and
running FreeBSD), you might want to run the commands for daily,
weekly, and monthly maintenance now and then. Run them as root
and give each one time to finish before you start the next one,
for now.
/etc/daily
/etc/weekly
/etc/monthly
If you get tired waiting, press Alt-F2 to get another
virtual console, and log in again. After all, it's a multi-user,
multi-tasking system. Nevertheless these commands will probably
flash messages on your screen while they're running; you can type
clear at the prompt to clear the screen. Once they've run, you
might want to look at /var/mail/root and
/var/log/messages.
Basically running such commands is part of system administration—and as
a single user of a Unix system, you're your own system administrator.
Virtually everything you need to be root to do is system administration.
Such responsibilities aren't covered very well even in those big fat books
on Unix, which seem to devote a lot of space to pulling down menus in
windows managers. You might want to get one of the two leading books
on systems administration, either Evi Nemeth et.al.'s UNIX System
Administration Handbook (Prentice-Hall, 1995, ISBN 0-13-15051-7)—the
second edition with the red cover; or Æleen Frisch's Essential System
Administration (O'Reilly & Associates, 1993, ISBN 0-937175-80-3).
I used Nemeth.
Editing Text
To configure your system, you need to edit text files. Most
of them will be in the /etc directory; and you'll need
to su to root to be able to change them. The text
editor is vi. Before you edit a file, you should
probably back it up. Suppose you want to edit
/etc/sysconfig. You could just use cd /etc to
get to the /etc directory and do:
cp sysconfig sysconfig.orig
This would copy sysconfig to sysconfig.orig,
and you could later copy sysconfig.orig to
sysconfig to recover the original. But even better
would be moving (renaming) and then copying back:
mv sysconfig sysconfig.orig
cp sysconfig.orig sysconfig
because the mv command preserves the original date and
owner of the file. You can now edit sysconfig. If you
want the original back, you'd then mv sysconfig syconfig.myedit
(assuming you want to preserve your edited version) and then
mv sysconfig.orig sysconfig
to put things back the way they were.
To edit a file, type
vi filename
Move through the text with the arrow keys. Esc (the
escape key) puts vi in command mode. Here are some
commands:
x/ delete letter the cursor is on
dd/ delete the entire line (even if
it wraps on the screen)
i/ insert text at the cursor
a/ insert text after the cursor
Once you type i or a, you can enter text.
Esc puts you back in command mode where you can type
:w/ to write your changes to disk and continue editing
:wq/ to write and quit
:q!/ to quit without saving changes
/text to move the cursor
to text; /Enter (the enter
key) to find the next instance of text.
G/ to go to the end of the file
nG/ to go to line n in
the file, where n is a number
Ctrl-L/ to redraw the screen
Ctrl-b and Ctrl-f/ go back
and forward a screen, as they
do with more and view.
Practice with vi in your home directory by creating a
new file with vi filename and adding and deleting text,
saving the file, and calling it up again. vi delivers
some surprises because it's really quite complex, and sometimes
you'll inadvertently issue a command that will do something you
don't expect. (Some people actually like vi—it's more
powerful than DOS EDIT—find out about the :r command.)
Use Esc one or more times to be sure you're in command
mode and proceed from there when it gives you trouble, save often
with :w, and use :q! to get out and start over
(from your last :w) when you need to.
Now you can cd to /etc, su to root,
use vi to edit the file /etc/group, and add a
user to wheel so the user has root privileges. Just add a comma
and the user's login name to the end of the first line in the
file, press Esc, and use :wq to write the file
to disk and quit. Instantly effective. (You didn't put a space
after the comma, did you?)
Printing Files from DOS
At this point you probably don't have the printer working, so here's a
way to create a file from a man page, move it to a floppy, and then
print it from DOS. Suppose you want to read carefully about changing
permissions on files (pretty important). You can use the command
man chmod to read about it. The command
man chmod > chmod.txt
will send the man page to the chmod.txt file instead of showing it on
your screen. Now put a dos-formatted diskette in your floppy drive a,
su to root, and type
/sbin/mount -t msdos /dev/fd0 /mnt
to mount the floppy drive on /mnt.
Now (you no longer need to be root, and you can type exit to get
back to being user jack) you can go to the directory where you created
chmod.txt and copy the file to the floppy with:
cp chmod.txt /mnt
and use ls /mnt to get a directory listing of
/mnt, which should show the file chmod.txt.
You might especially want to make a file from /sbin/dmesg by typing
/sbin/dmesg > dmesg.txt
and copying dmesg.txt to the floppy. /sbin/dmesg is the boot
log record,
and it's useful to understand it because it shows what FreeBSD found
when it booted up. If you ask questions on questions@freebsd.org or on
a USENET group—like ``FreeBSD isn't finding my tape drive, what do I
do?''—people will want to know what dmesg has to say.
You can now dismount the floppy drive (as root) to get the disk out with
/sbin/umount /mnt
or reboot to go to DOS. Copy these files to a DOS directory, call them
up with DOS EDIT, Windows Notepad, or a word processor, make a minor
change so the file has to be saved, and print as you normally would
from DOS or Windows. Hope it works! man pages come out best if printed
with the dos print command. (Copying files from FreeBSD to a mounted
dos partition is in some cases still a little risky.)
Getting the printer printing from FreeBSD involves
creating an appropriate entry in /etc/printcap and creating
a matching spool directory in /var/spool/output. If your
printer is on lpt0 (what dos calls LPT1), you may only need to
go to /var/spool/output and (as root) create the directory
lpd by typing:
mkdir lpd
Then the printer should respond if it's turned on when the
system is booted, and lp or lpr should send a file to the printer.
Whether or not the file actually prints depends on configuring it, which is
covered in the FreeBSD handbook.
Other Useful Commands
df/ shows file space and mounted systems.
ps aux/ shows processes running. ps ax is a narrower form.
lsdev/ lists configured devices
devmenu/ a menu of devices—in color!
rm filename/ remove filename
rm -R dir/ removes a directory dir and all
subdirectories—careful!
ls -R/ lists files in the current
directory and all subdirectories;
I used a variant, ls -AFR > where.txt,
to get a list of all
the files in / and (separately)
/usr before I found better
ways to find files.
passwd/ to change user's password (or root's password)
man hier/ man page on the Unix file system
Use find to locate filename in /usr or any of its subdirectories with
find /usr -name "filename"
You can use * as a wildcard in "filename"
(which should be in quotes). If you tell find to search in
/ instead of /usr it will look for the file(s)
on all mounted file systems, including the CDROM and the dos
partition.
An excellent book that explains Unix commands and utilities is
Abrahams & Larson, Unix for the Impatient (2nd ed.,
Addison-Wesley, 1996). There's also a lot of Unix information on
the Internet. Try the .
Next Steps
You should now have the tools you need to get around and edit
files, so you can get everything up and running. There is a
great deal of information in the FreeBSD handbook (which is
probably on your hard drive) and . A wide
variety of packages and ports are on the CDROM as well as
the web site. The handbook tells you more about how to use them
(get the package if it exists, with pkg_add
/cdrom/packages/All/packagename, where
packagename is the filename of the package). The cdrom
has lists of the packages and ports with brief descriptions in
cdrom/packages/index, cdrom/packages/index.txt,
and cdrom/ports/index, with fuller descriptions in
/cdrom/ports/*/*/pkg/DESCR, where the *s
represent subdirectories of kinds of programs and program names
respectively.
If you find the handbook too sophisticated (what with
lndir and all) on installing ports from the cdrom,
here's what usually works:
Find the port you want, say kermit. There will be a directory
for it on the cdrom. Copy the subdirectory to
/usr/local (a good place for software you add that
should be available to all users) with:
cp -R /cdrom/ports/comm/kermit /usr/local
This should result in a /usr/local/kermit subdirectory
that has all the files that the kermit subdirectory on
the CDROM has.
Next, check /cdrom/ports/distfiles for a file with a name
that indicates it's the port you want. Copy that file to
/usr/ports/distfiles. (Create /usr/ports/distfiles
if it doesn't exist using mkdir.) In the case of kermit,
there is no distfile.
Then cd to the subdirectory of
/usr/local/kermit that has the file Makefile. Type
make all install
During this process the port will ftp to get any compressed files it
needs that it didn't find in /usr/ports/distfiles. If you
don't have your network running yet and there was no file for the
port in /cdrom/ports/distfiles, you will have to get the
distfile using another machine and copy it to
/usr/ports/distfiles from a floppy or your dos partition.
Read Makefile (with cat or more or
view) to find out where to go (the master distribution site)
to get the file and what its name is. Its name will be truncated
when downloaded to DOS, and after you get it into
/usr/ports/distfiles you'll have to rename it (with the
mv command) to its original name so it can be found. (Use
binary file transfers!) Then go back to /usr/local/kermit,
find the directory with Makefile, and type make all
install.
The other thing that happens when installing ports or packages is that
some other program is needed. If the installation stops with a message
"can't find unzip" or whatever, you might need to install the package
or port for unzip before you continue.
Once it's installed type rehash to make FreeBSD
reread the files in the path so it knows what's there.
(If you get a lot of "path not found" messages when you use
whereis or which, you might want to make additions to
the list of directories in the path statement in .cshrc
in your home directory. The path statement in Unix does the same
kind of work it does in DOS, except the current directory is not
(by default) in the path for security reasons; if
the command you want is in the directory you're in, you need to
type ./ before the command to make it work; no space after the
slash.)
You might want to get the most recent version of Netscape from their
. (Netscape
requires the X Window System.) The version you want is the "unknown
bsd" version. Just use gunzip filename and tar
xvf filename on it, move the binary to
/usr/local/bin or some other place binaries are kept,
rehash, and then put the following lines in .cshrc
in each user's home directory or (easier) in
/etc/csh.cshrc, the system-wide csh start-up file:
setenv XKEYSYMDB /usr/X11R6/lib/X11/XKeysymDB
setenv XNLSPATH /usr/X11R6/lib/X11/nls
This assumes that the file XKeysymDB and the directory
nls are in
/usr/X11R6/lib/X11; if they're not, find them and put them there.
If you originally got Netscape as a port using the CDROM (or ftp),
don't replace /usr/local/bin/netscape with the new netscape binary;
this is just a shell script that sets up the environmental variables
for you. Instead rename the new binary to netscape.bin and replace the
old
binary, which is /usr/local/lib/netscape/netscape.bin.
Other
As root, you can dismount the CDROM with /sbin/umount
/cdrom, take it out of the drive, insert another one, and
mount it with /sbin/mount_cd9660 /dev/cd0a /cdrom
assuming cd0a is the device name for your CDROM drive.
Using the live file system—the second of FreeBSD's CDROM disks—is
useful if you've got limited space. You might try using
emacs or playing games from the cdrom. This involves using
lndir, which gets installed with the X Window System, to tell the
program(s) where to find the necessary files, because they're in the
/cdrom file system instead of in /usr and its
subdirectories, which is where they're expected to be. Read man
lndir.
You can delete a user (say, jack) by using the command vipw
to bring up the master.passwd file (do not use vi directly
on master.passwd); delete the line for jack and save the file. Then
edit /etc/group, eliminating jack wherever it appears.
Finally, go to /usr/home and use rm -R jack (to
get rid of user jack's home directory files).
Comments Welcome
If you use this guide I'd be interested in knowing where it was
unclear and what was left out that you think should be included, and
if it was helpful. My thanks to Eugene W. Stark, professor of
computer science at SUNY-Stony Brook, and John Fieber for helpful
comments.
Annelise Anderson