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Prediction Source "History" does not use all of the PSReadline history #5014
Description
Prerequisites
- Write a descriptive title.
- Make sure you are able to repro it on the latest released version
- Search the existing issues, especially the pinned issues.
Exception report
N/AScreenshot
N/A
Environment data
PS Version: 7.5.4
PS HostName: ConsoleHost (Windows Terminal)
PSReadLine Version: 2.4.5
PSReadLine EditMode: Windows
OS: 10.0.26100.1 (WinBuild.160101.0800)
BufferWidth: 133
BufferHeight: 38Steps to reproduce
- Set
Set-PSReadLineOption -MaximumHistoryCount 200000 - Not so sure how to arbitrarily fill the history but you need to ensure your history at
(cat (get-psreadLineOption).HistorySavePath | Measure-Object).Countis over5128 - Get the first item from history
cat (get-psreadLineOption).HistorySavePath -First 1 - Start typing the string from Step 3 in powershell, the history predictor does not show up anything even thought the item is already in PSReadline history
Expected behavior
The step 4 above should show the item from PSReadline history
Actual behavior
The step 4 above does not show the item from PSReadline history. It seems like the last item it will be show is (Current History Count)-5127
Activity
mrenton999 commentedon Apr 10, 2026
I have another example of it failing, without having done Set-PSReadLineOption -MaximumHistoryCount
In this screenshot, on the last command, PSReadline should match on one of the 'New-Alias c cNameFetch' lines in the history file, and suggest the auto-completion; but it does not.
There are about 146,361 lines in the file, and in the example given here, that line exists as line 136,549
When typing 'New-Alias ', an auto-completion for a different line is suggested.
(gc $BigHistFile).Count
146361
Are maybe both of these problems just due to this low (default) setting?
[PSReadLine seems to me to be scanning further back than 100 commands.]
(Get-PSReadLineOption).CompletionQueryItems
100
mrenton999 commentedon Apr 10, 2026
Sorry; I found the Set-PSReadLine documentation, and the -CompletionQueryItems is irrelevant.