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Excerpt from:   bashref.info   >>   Bash Variables   >>   PROMPT_COMMAND variable


If set, the value is interpreted as a command to execute before the
printing of each primary prompt ('$PS1').

Excerpt from:   bashref.info   >>   Controlling the Prompt   >>   PROMPT_COMMAND variable


Controlling the Prompt

The value of the variable 'PROMPT_COMMAND' is examined just before Bash
prints each primary prompt. If 'PROMPT_COMMAND' is set and has a
non-null value, 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 'PS1' to 'PS4':

A bell character.
The date, in 'Weekday Month Date' format (e.g., 'Tue May 26').
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 required.
An escape character.
The hostname, up to the first '.'.
The hostname.
The number of jobs currently managed by the shell.
The basename of the shell's terminal device name.

A newline.

A carriage return.
The name of the shell, the basename of '$0' (the portion following
the final slash).

The time, in 24-hour HH:MM:SS format.
The time, in 12-hour HH:MM:SS format.
The time, in 12-hour am/pm format.
The time, in 24-hour HH:MM format.
The username of the current user.
The version of Bash (e.g., 2.00)
The release of Bash, version + patchlevel (e.g., 2.00.0)
The current working directory, with '$HOME' abbreviated with a
tilde (uses the '$PROMPT_DIRTRIM' variable).
The basename of '$PWD', with '$HOME' abbreviated with a tilde.
The history number of this command.
The command number of this command.
If the effective uid is 0, '#', otherwise '$'.
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.

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 (*note Bash History
Facilities::), 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 (*note Bash Builtins::).


Daily updated index of the presence and value of this variable for each model. Last update: 2022-10-03 04:52 GMT.
Showing all models using this variable. Click any column header (click-wait-click) to sort the list by the respective data.
The (main/scrpn/boot/arm/prx/atom) label in the Model column shows which CPU is meant for models with multiple Linux instances.
Note that this list is merged from Firmware-Probes of all known AVM firmware for a model, including Recovery.exe and Labor-Files.
If the 'Value' column contains '<comp>' the variable is computed at runtime. '<empty>' means the variable is present but empty (rare).
Multiple values typically show a conditional static assignment or different values in different firmware.

Model Firmware Value Origin
FRITZ!Box 6591 Cable (arm) 7.04 - 7.39 <any> bash
FRITZ!Box 6591 Cable (atom) 7.04 - 7.39 <any> bash
FRITZ!Box 6660 Cable (arm) 7.14 - 7.39 <any> bash
FRITZ!Box 6660 Cable (atom) 7.14 - 7.39 <any> bash
FRITZ!Box 6690 Cable (arm) 7.28 - 7.39 <any> bash
FRITZ!Box 6690 Cable (atom) 7.28 - 7.39 <any> bash
6 models use this variable


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