When executing interactively, bash  displays  the  primary
  prompt  PS1  when  it  is ready to read a command, and the
  secondary prompt PS2 when it needs more input to  complete
  a  command.   Bash  allows these prompt strings to be cus-
  tomized by inserting a number of backslash-escaped special
  characters that are decoded as follows:
         \a     an ASCII bell character (07)
         \d     the  date  in  "Weekday  Month  Date" format
                (e.g., "Tue May 26")
         \e     an ASCII escape character (033)
         \h     the hostname up to the first `.'
         \H     the hostname
         \n     newline
         \r     carriage return
         \s     the name of the shell, the  basename  of  $0
                (the portion following the final slash)
         \t     the current time in 24-hour HH:MM:SS format
         \T     the current time in 12-hour HH:MM:SS format
         \@     the current time in 12-hour am/pm format
         \u     the username of the current user
         \v     the version of bash (e.g., 2.00)
         \V     the  release  of  bash, version + patchlevel
                (e.g., 2.00.0)
         \w     the current working directory
         \W     the basename of the current  working  direc-
         \!     the history number of this command
         \#     the command number of this command
         \$     if  the effective UID is 0, a #, otherwise a
         \nnn   the character  corresponding  to  the  octal
                number nnn
         \\     a backslash
         \[     begin a sequence of non-printing characters,
                which could be used to embed a terminal con-
                trol sequence into the prompt
         \]     end a sequence of non-printing characters

[giles@nikola giles]$ PS1="\u@\h \W> "
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