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[e]0;[email?protected]h: wa]
This is an escape sequence which will set the terminal title text to?[email?protected]$HOST: $PWD.
[?and?]?indicate the beginning and end of a sequence of non-printing characters.
e?is an ASCII escape character.
]0;?is the specific escape sequence to?set the terminal icon and title?in?xterm?compatible terminals
u?expands to the username of the current user.
@?is a literal @.
h?expands to the hostname.
:?is a literal colon character.
w?expands to the current working directory.
a?is an ASCII bell character.
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${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.?$debian_chrootis a variable initalized in?/etc/bash.bashrc?to the contents of the file?/etc/debian_chroot. Thus if your chroot environment includes this file,the prompt will include the contents of that file as an indication for which chroot the shell currently operates in.
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[email?protected]h:w$
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 $.
