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<<From man bash>>


      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 customized 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
                    the format is passed to strftime(3)  and  the  result  is
                    inserted  into the prompt string; an empty format results
                    in a locale-specific time representation.  The braces are
             \e     an ASCII escape character (033)
             \h     the hostname up to the first ‘.’
             \H     the hostname
             \j     the number of jobs currently managed by the shell
             \l     the basename of the shell’s terminal device name
             \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
             \A     the current time in 24-hour HH:MM format
             \u     the username of the current user
             \v     the version of bash (e.g., 2.00)
             \V     the release of bash, version + patch level (e.g., 2.00.0)
             \w     the  current  working  directory,  with $HOME abbreviated
                    with a tilde
             \W     the basename of the current working directory, with $HOME
                    abbreviated with a tilde
             \!     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
             \[     begin  a sequence of non-printing characters, which could
                    be used to embed a terminal  control  sequence  into  the
             \]     end a sequence of non-printing characters
      The  command  number  and the history number are usually different: the
      history number of a command is its position in the history list,  which
      may  include  commands  restored  from  the  history  file (see HISTORY
      below), while the command number is the position  in  the  sequence  of
      commands  executed  during the current shell session.  After the string
      is decoded, it is expanded via parameter expansion,  command  substitu-
      tion,  arithmetic expansion, and quote removal, subject to the value of
      the promptvars shell option (see the description of the  shopt  command
      under SHELL BUILTIN COMMANDS below).
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