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This function expands system paths (the non-absolute paths become absolute) and replaces the environment variables (e.g, ${HOME}) with their values.
${HOME}
.expandPath(path)
file path to expand. Potentially any string
Expanded path or untouched string
Most importantly strings that are not system paths are returned untouched
# NOT RUN { string = "https://www.r-project.org/" .expandPath(string) path = "$HOME/my/path/string.txt" .expandPath(path) # }
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