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open selected directory or file
o(file = ".")
No return value, called for opening specific directory or file
to be open; open working directory by default
Guangchuang Yu
Other io-utils: read.cb(), show_in_excel(), yread_tsv()
read.cb()
show_in_excel()
yread_tsv()
if (FALSE) { ## to open current working directory o() }
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