René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Select-Object: Add a -NotIndex parameter to complement -Index to select all BUT the objects at the specified positions","articleBody":"See also: #11752\r\n\r\n## Summary of the new feature/enhancement\r\n\r\n`Select-Object -Index` allows me to select a subset of the input objects by an array of indices (`0`-based positions in the input stream):\r\n\r\n```powershell\r\nPS\u003e 1..5 | Select-Object -Index 1, 3  # here the same as: (1..5)[1,3]\r\n2\r\n4\r\n```\r\n\r\nIt would be helpful to be able to select the _complement_, i.e. all elements _other_ than the ones specified, using a new `-NotIndex` parameter:\r\n\r\n_Update_: The original proposal suggested a separate `-Not` switch to be combined with `-Index`, but this was changed based on @jhoneill's suggestion.\r\n\r\n```powershell\r\n# WISHFUL THINKING: -Not returns everything *but* the objects at the specified positions.\r\nPS\u003e 1..5 | Select-Object -NotIndex 1, 3 \r\n1\r\n3\r\n5\r\n```\r\n\r\nFor instance, it would allow you to exclude a line with a given number from an array of a file's input lines:\r\n\r\n```powershell\r\n# WISHFUL THINKING\r\nPS\u003e 1..3 + 'exclude me' + 4..5 \u003e sample.txt; Get-Content sample.txt | Select-Object -NotIndex 3\r\n1\r\n2\r\n3\r\n4\r\n5\r\n```\r\n\r\nNote: While it is hypothetically possible to allow _combining_ `-Index` with `-NotIndex`,  it wouldn't be easy to reason about by the user and is probably of little practical value.\r\nThus, `-Index` and `-NotIndex` should be made mutually exclusive.\r\n\r\n","author":{"url":"https://github.com/mklement0","@type":"Person","name":"mklement0"},"datePublished":"2020-10-10T19:48:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/13769/PowerShell/issues/13769"}