Telnet is a program used to connect to and log into a remote computer.

Unlike the PC environment, UNIX is a case-sensitive environment. This means that file and folder names like mydoc.txt and MYDOC.TXT are considered different. That is, UNIX distinguishes between uppercase and lowercase letters in th e alphabet.

Unlike the Windows NT environment with all of its graphical images and color, UNIX is an unfriendly (image sounds from an old Tarzan flick here) text-based environment. Why do we use UNIX if it is so unfriendly?

In order to communicate with the UNIX operating system we must become familiar with some basic commands.

• Move or rename a file
  mv source destination
• Remove a file
  rm filename
• Remove a directory
  rmdir directoryname
• Make a directory
  mkdir directoryname
• Change directory
  cd path
  

  cd      change to the root
  
  cd ..   change to parent directory
  

• Copy a file
  cp source destination
• Print working directory (where am I?)
  pwd
• Directory listing (what's in the working folder?)
  ls
  ls -al
• Type a file
  cat filename
• Type a file one screen at a time
  more filename
• Log off
  exit
• Change file protection
  add protection
  chmod [ugo]+[rwx] filename
  remove protection
  chmod [ugo]-[rwx] filename
• Print a file
  lpr -Pprinter filename
  printer = cl or beh or fq
• Check the status of a print job
  lpq -Pprinter
• Search for an e-mail address
  finger person'sname
• Change password
  passwd
• Start a script (file)
  script filename
• Who is logged on?
  who
• Manual pages about a command
  man command
• Redirection of command results to a file
  command > filename
• Interrupt a process
  CTRL + C