[gurutech]

ahò ma le dopie letere dove le hai lasciate?
comunque da pagina man bash:

PROMPTING
       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 spe_
       cial 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
              \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 + patchelvel (e.g., 2.00.0)
              \w     the current working directory
              \W     the basename of the current working directory
              \!     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
              \[     begin  a  sequence  of  non-printing characters, which could be used to embed a
                     terminal control sequence into the prompt
              \]     end a sequence of non-printing characters

       The command number and the history number are usually different: the history number of a com_
       mand  is  its position in the history list, which may include commands restored from the his_
       tory 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  substitution,  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).

per cui se scrivi ad esempio

export PS1="\u@\h:\w\$]"

ottieni

gianluca@linuxhome:~$]