Here are some basic linux and unix commands and a description of what they do. Hope they are helpful

cat

Lets you view the contents of a file. Many linux commands can use the redirection symbol > to redirect the output of the command. For example, use the redirection symbol with the cat command to copy a file: cat /etc/shells > newfile ( the contents of the shells file are written to newfile ).

cd

Changes the directory.

chmod

This command changes the attributes assigned to a file and is similar to the DOS Attrib command.

clear

Clears the screen. This command is useful when the screen has become cluttered with commands and data that you no longer need to view.

cp

Used to copy a file.

date

Entered alone, this command displays the current system date settings. Entered in the format date <mmddhhmmyy>, this command sete the system date.

echo

Displays information on the screen.

fdisk

Creates or makes changes to a hard drive partition table.

grep

Searches for a specific pattern in a file or in multiple files.

hostname

Displays a server's FQDN.

ifconfig
Used to troubleshoot problems with network connections under TCP/IP, this command can disable and enable network cards and release and renew the IP address assigned to these cards.

kill

Kills a process instead of waiting for the process to terminate.

Ls

This command is similar to the DOS Dir command, which displays a list of directories and files.

man

Displays the online help manual, called man pages.

mkdir

This command makes a new directory.

|more

Appended to a command to display the results of the command on the screen one page at a time.

mv

Moves a file or renames it, if the source and destination are the same directory.

nestat

Shows statistics and status information for network connections and routing tables.

nslookup

Queries doman name servers to look up domain names.

ping

Used to test network connections by sending a request packet to a host. If a connection is successful, the host will return a response packet.

ps

Displays the process table so that you can identify process ID's for currently running processes.

pwd

Shows the name of the present working directory.

reboot

Reboots the system.

rm

Removes the file or files that are specified.

rmdir

Removes a directory.

route

Entered alone, this command shows the current configuration of the IP routing table. Entered in the following format, it configures the IP routing table: route [options]

vi

Launches a full screen editor that can be used to edit a file.

whatis

Displays a brief overview of a command.

who

Displays a list of useres currently logged in.
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