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The value of the variable PROMPT_COMMAND is examined just before
Bash prints each primary prompt. If it is set and non-null, then the
value is executed just as if it had been typed on the command line.
In addition, the following table describes the special characters which
can appear in the prompt variables:
\a
-
A bell character.
\d
-
The date, in "Weekday Month Date" format (e.g., "Tue May 26").
\e
-
An escape character.
\h
-
The hostname, up to the first `.'.
\H
-
The hostname.
\n
-
A newline.
\r
-
A carriage return.
\s
-
The name of the shell, the basename of
$0 (the portion
following the final slash).
\t
-
The time, in 24-hour HH:MM:SS format.
\T
-
The time, in 12-hour HH:MM:SS format.
\@
-
The 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
$PWD.
\!
-
The history number of this command.
\#
-
The command number of this command.
\$
-
If the effective uid is 0,
#, otherwise $.
\nnn
-
The character whose ASCII code is the octal value nnn.
\\
-
A backslash.
\[
-
Begin a sequence of non-printing characters. This could be used to
embed a terminal control sequence into the prompt.
\]
-
End a sequence of non-printing characters.
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