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Re:PowerShell is open sourced and is available on Linux by ktRolster on Thursday August 18, 2016 @02:03PM (#12314897)
Autocomplete in Bash was actually a revolutionary improvement
Re:PowerShell is open sourced and is available on Linux by jodrellblank on Friday August 19, 2016 @03:47AM (#12318529)
And autocomplete in PowerShell is again.

Cmdlets tell the shell their parameters, and their parameters are long names, so you can just tab through them to find a) the available parameters and b) the ones which might help you.