I am running an Ubuntu VM out of Virtual Box and Vagrant:vagrant@lucid64:~$ uname -aLinux lucid64 2.6.32-38-server #83-Ubuntu SMP Wed Jan 4 11:26:59 UTC 2012 x86_64 GNU/LinuxMy $PS1 variable doesn't actually match the prompt and is far more complex:vagrant@lucid64:~$ echo $PS1\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\u@\h:\w\$I am looking for an explanation of the relationship between the $PS1 and my prompt, which is $USER@$HOST:$PWD\$, as can be seen above.E.g., on my regular laptop, which hosts this VM and is a Mac, it is clean and simple as follows:~@12:10:20>echo $PS1\w@\t>
$PS1 on Ubuntu VM does not match actual prompt
bash;prompt
The default $PS1 in Ubuntu consists of three parts:\[\e]0;\u@\h: \w\a\] This is an escape sequence which will set the terminal title text to $USER@$HOST: $PWD.\[ and \] indicate  the beginning and end of a sequence of non-printing characters.\e is an ASCII escape character.]0; is the specific escape sequence to set the terminal icon and title in xterm compatible terminals\u expands to the username of the current user.@ is a literal @.\h expands to the hostname.: is a literal colon character.\w expands to the current working directory.\a is an ASCII bell character.${debian_chroot:+($debian_chroot)}If you're in a chroot environment, this will expand to the name of the chroot in parentheses.${var:+OTHER} evaluates to $OTHER if var is set, otherwise as null string. $debian_chroot is a variable initalized in /etc/bash.bashrc to the contents of the file /etc/debian_chroot. Thus if your chroot environment includes this file, the prompt will include the contents of that file as an indication for which chroot the shell currently operates in.\u@\h:\w\$This is the actual prompt you typically see. \u, @, \h, :, \w are as above.\$ expands to a number sign # if the effective uid is zero (i.e. user is root), otherwise it expands to a dollar sign $.ResourcesBash prompt escape sequencesPrompt magicHow to change the title of and xterm