scripts/boost/generate-ports.ps1 not running properly on linux using pwsh

[aleksas]

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executing scripts/boost/generate-ports.ps1 using powershell on Ubuntu 18.04 cause errors.
mkdir, ls, findstr calls are interpreted as linux commands which lead to failures. These should be replaced with non-aliased powershell commands .

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mkdir, ls, findstr calls should be replaced with non-aliased powershell commands .