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-_ Jeremy's Linux Quick Tips version 1.6.1                         _-
-_ http://www.dcos.net/projects/linux-quick-tips-1.6.1.text        _-
-_ E-Mail: info@dcos.net	                                   _-
-_ licensed: CC-BY-SA						   _-
-_ Document format: command's first, 1 line comment follows        _-
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date MMDDhhmmYY
setting date and time

date YYYYMMDDhhmm
setting date and time on busybox's date command(think embedded systems)

ifconfig -i eth0 192.168.0.100 netmask 255.255.255.0 up
static ip

route add default gw 192.168.0.1
static gateway

domain some.dns.providor.net
nameserver #.#.#.#
nameserver #.#.#.#
static dns for the contents of file /etc/resolv.conf

iptables -A INPUT -i eth1 -p tcp -m tcp --dport 80 -j ACCEPT
iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j DNAT --to-destination 192.168.0.100:80
iptables port forwarding

su
use this do not use root login its bad practice. and type exit when your done

sudo su
great quick root access if in the sudoers group. ubuntu and others.

e2fsck -fc /dev/hda1
works the same as typing scandisk in a windows/dos system, -f is force, -c is check for bad blocks(very time consuming)

sudo mount -rw /dev/sda1
mount a usb pendrive "that is if its the only usb device, and theres no sata or scsi disks. if so it would be /dev/sdb,c,d, or e if theres a card reader"

mount -l
shows a list of mounts along with type info

sudo umount /dev/sda1
unmounts the previos device "always unmount a usb pen!" you may have noticed sudo in front of most commands.you have to be root to mount a drive writeable

mount -o loop -t iso9660 /path/to/cdimage.iso /mnt/point/
i hope you cought on enough

dd if=/dev/cdrom of=cdimage.iso
creates an iso image of a cdrom "do not mount the drive!"

chroot /new/root-directory /bin/bash-or-some-shell-u-like

tar -acf somearchive.tar.lzma /some-folder-of-stuff-to-add
creates an archive in lzma format(high compressor)

ssh -p ### user@host.domain.topmost
secure shell usage ### being port number -p meaning use this port

scp -P ### /path/to/localdir/orfile.txt user@host.domain.topmost:/path/to/save/point/andfilename.txt
copies over ssh to a remote host your local file reverse the local and remote section to change the copy direction to local from remote.

ssh user@host -L [Local Adress:]<Local Port>:<remote address>:<remote port>
Single Port Tunneling with SSH
forwards local port traffic to remote host and specified port

ssh user@host -D <local port>
Dynamic Port Tunneling with SSH 
creates a socks proxy on the system it is run on

top
process list real time, press 1 and z when its loaded for extra func.

ps aux
process list ALL process's also sleeping and non topmost

ls -la
directory listing "like dir in dos/win"

--help
preceed with a space, but type that after ANY COMMAND and you will get a great quick usage refreance

thiscommandisafake
made you look :)

netstat -a | grep tcp
will display only tcp connections and no unix sockets

netstat -p
will display programs running that have a connection and its process id(pid)

w,users,who
varios ways of showing who is loged in.

uptime
display uptime

uname -a
system information arch type kern type etc etc.

links,lynx,elinks,w3m,netrik
web browsers, text based no images

fbi
frame buffer image-viewer

sudo mplayer -fs -vo fbdev /location/of/file.avi
will play file.avi at the shell "without" a gui

sudo xine -V fb /location/of/file.avi
will play file.avi at the shell "without" a gui

xmms
think winamp. . . .

nano, pico
text editor, similar to edit for dos, not a clone

cat somefile.txt
displays contents of file

cat somefile.txt | more
displays contents of file in a scrollable form

cat somefile.txt | grep 10-9.2
would display the entire line that contains a matching 10-9.2 "can be anything to grep for"

uname -a >> unameinfo.txt
saves the output to the file unameinfo.txt. this >> is append, > is overwrite.

last
lists all the last login sessions

last -n 10
displays the last 10 login sessions

id
gives user info typed alone about who your loged in as

id username
about this said user

adduser -m
adds a user

usermod -G group1,group2 username
adds the user to the 2 groups

ln -s /symlink/dir/ /actual/directory/
symlink symulates a dirs presense and redirects everything to the actual dir.

wget http://dcos.net/projects/Linux-Quick-Tips-1.6.1.txt
would download this file from my site "great for grabing hard to get scripts"

emacs
editor, press ctrl-x-ctrl-c to quit. ctrl-x-ctrl-s to save.

 vi, vim
editor, press shift and : then q then enter to exit. wq and enter to save and exit

echo "this is an example" && echo " " && echo "notice the way this works?" && w && ls -a
side note, && means only run next command if previos command didnt fail ;) quite usefull btw