Set-PSReadLineOption

Specifies a ScriptBlock that controls which commands get added to PSReadLine history.

The ScriptBlock receives the command line as input. If the ScriptBlock returns $True, the command line is added to the history.

This option is specific to Windows when input is redirected, for example, when running under tmux or screen.

With redirected input on Windows, many keys are sent as a sequence of characters starting with the escape character. It's impossible to distinguish between a single escape character followed by more characters and a valid escape sequence.

The assumption is that the terminal can send the characters faster than a user types. PSReadLine waits for this timeout before concluding that it has received a complete escape sequence.

If you see random or unexpected characters when you type, you can adjust this timeout.

Specifies how PSReadLine responds to various error and ambiguous conditions.

The valid values are as follows:

• Audible: A short beep.
• Visual: Text flashes briefly.
• None: No feedback.

The Colors parameter specifies various colors used by PSReadLine.

The argument is a hash table where the keys specify which element and the values specify the color. For more information, see about_Hash_Tables.

Colors can be either a value from ConsoleColor, for example [ConsoleColor]::Red, or a valid ANSI escape sequence. Valid escape sequences depend on your terminal. In PowerShell 5.0, an example escape sequence for red text is $([char]0x1b)[91m. In PowerShell 6 and above, the same escape sequence is `e[91m. You can specify other escape sequences including the following types:

• 256 color
• 24-bit color
• Foreground, background, or both
• Inverse, bold

For more information about ANSI color codes, see ANSI escape code in Wikipedia.

The valid keys include:

• ContinuationPrompt: The color of the continuation prompt.
• Emphasis: The emphasis color. For example, the matching text when searching history.
• Error: The error color. For example, in the prompt.
• Selection: The color to highlight the menu selection or selected text.
• Default: The default token color.
• Comment: The comment token color.
• Keyword: The keyword token color.
• String: The string token color.
• Operator: The operator token color.
• Variable: The variable token color.
• Command: The command token color.
• Parameter: The parameter token color.
• Type: The type token color.
• Number: The number token color.
• Member: The member name token color.
• InlinePrediction: The color for the inline view of the predictive suggestion.

Specifies a ScriptBlock that is called from ValidateAndAcceptLine. If an exception is thrown, validation fails and the error is reported.

Before throwing an exception, the validation handler can place the cursor at the point of the error to make it easier to fix. A validation handler can also change the command line, such as to correct common typographical errors.

ValidateAndAcceptLine is used to avoid cluttering your history with commands that can't work.

Specifies the maximum number of completion items that are shown without prompting.

If the number of items to show is greater than this value, PSReadLine prompts yes/no before displaying the completion items.

Specifies the string displayed at the beginning of the subsequent lines when multi-line input is entered. The default is double greater-than signs (>>). An empty string is valid.

Specifies the duration of the beep when BellStyle is set to Audible.

Specifies the tone in Hertz (Hz) of the beep when BellStyle is set to Audible.

Specifies the command line editing mode. Using this parameter resets any key bindings set by Set-PSReadLineKeyHandler.

The valid values are as follows:

• Windows: Key bindings emulate PowerShell, cmd, and Visual Studio.
• Emacs: Key bindings emulate Bash or Emacs.
• Vi: Key bindings emulate Vi.

Use Get-PSReadLineKeyHandler to see the key bindings for the currently configured EditMode.

Specifies the number of extra lines.

If your prompt spans more than one line, specify a value for this parameter. Use this option when you want extra lines to be available when PSReadLine displays the prompt after showing some output. For example, PSReadLine returns a list of completions.

This option is needed less than in previous versions of PSReadLine, but is useful when the InvokePrompt function is used.

This option controls the recall behavior. Duplicate commands are still added to the history file. When this option is set, only the most recent invocation appears when recalling commands. Repeated commands are added to history to preserve ordering during recall. However, you typically don't want to see the command multiple times when recalling or searching the history.

By default, the HistoryNoDuplicates property of the global PSConsoleReadLineOptions object is set to True. Using this SwitchParameter sets the property value to True. To change the property value, you must specify the value of the SwitchParameter as follows: -HistoryNoDuplicates:$False.

Using the following command, you can set the property value directly:

(Get-PSReadLineOption).HistoryNoDuplicates = $False

Specifies the path to the file where history is saved. Computers running Windows or non-Windows platforms store the file in different locations. The filename is stored in a variable $($host.Name)_history.txt, for example ConsoleHost_history.txt.

If you don't use this parameter, the default path is as follows:

Windows

• $env:APPDATA\Microsoft\Windows\PowerShell\PSReadLine\$($host.Name)_history.txt

non-Windows

• $env:XDG_DATA_HOME/powershell/PSReadLine/$($host.Name)_history.txt
• $env:HOME/.local/share/powershell/PSReadLine/$($host.Name)_history.txt

Specifies how PSReadLine saves history.

Valid values are as follows:

• SaveIncrementally: Save history after each command is executed and share across multiple instances of PowerShell.
• SaveAtExit: Append history file when PowerShell exits.
• SaveNothing: Don't use a history file.

Specifies that history searching is case-sensitive in functions like ReverseSearchHistory or HistorySearchBackward.

By default, the HistorySearchCaseSensitive property of the global PSConsoleReadLineOptions object is set to False. Using this SwitchParameter sets the property value to True. To change the property value back, you must specify the value of the SwitchParameter as follows: -HistorySearchCaseSensitive:$False.

Using the following command, you can set the property value directly:

(Get-PSReadLineOption).HistorySearchCaseSensitive = $False

Indicates that the cursor moves to the end of commands that you load from history by using a search. When this parameter is set to $False, the cursor remains at the position it was when you pressed the up or down arrows.

By default, the HistorySearchCursorMovesToEnd property of the global PSConsoleReadLineOptions object is set to False. Using this SwitchParameter set the property value to True. To change the property value back, you must specify the value of the SwitchParameter as follows: -HistorySearchCursorMovesToEnd:$False.

Using the following command, you can set the property value directly:

(Get-PSReadLineOption).HistorySearchCursorMovesToEnd = $False

Specifies the maximum number of commands to save in PSReadLine history.

PSReadLine history is separate from PowerShell history.

Specifies the maximum number of items stored in the kill ring.

Specifies the source for PSReadLine to get predictive suggestions.

Valid values are:

• None: disable the predictive suggestion feature
• History: get predictive suggestions from history only

When there's a parse error, PSReadLine changes a part of the prompt red. PSReadLine analyzes your prompt function to determine how to change only the color of part of your prompt. This analysis isn't 100% reliable.

Use this option if PSReadLine is changing your prompt in unexpected ways. Include any trailing whitespace.

For example, if your prompt function looked like the following example:

function prompt { Write-Host -NoNewLine -ForegroundColor Yellow "$pwd"; return "# " }

Then set:

Set-PSReadLineOption -PromptText "# "

When displaying possible completions, tooltips are shown in the list of completions.

This option is enabled by default. This option wasn't enabled by default in prior versions of PSReadLine. To disable, set this option to $False.

By default, the ShowToolTips property of the global PSConsoleReadLineOptions object is set to True. Using this SwitchParameter sets the property value to True. To change the property value, you must specify the value of the SwitchParameter as follows: -ShowToolTips:$False.

Using the following command, you can set the property value directly:

(Get-PSReadLineOption).ShowToolTips = $False

When the ViModeIndicator is set to Script, the script block provided will be invoked every time the mode changes. The script block is provided one argument of type ViMode.

This parameter was introduced in PowerShell 7.

This option sets the visual indication for the current Vi mode. Either insert mode or command mode.

The valid values are as follows:

• None: There's no indication.
• Prompt: The prompt changes color.
• Cursor: The cursor changes size.
• Script: User-specified text is printed.

Specifies the characters that delimit words for functions like ForwardWord or KillWord.