sort: missing functions appear in MS version

ROS' sort utility is missing some functions appear in MS version, for example:

• reading file from command line argument (i.e. sort mytextfile.txt)
• writing output to a file specified in command line argument (i.e. sort mytextfile.txt /o sorted.txt)
• configurable maximum record size (i.e. /REC[ORD_MAXIMUM] switch)
• sort by Locale (i.e. /L[OCALE] locale switch)
• long options

And there are some undocumented switches:

• /case_sensitive (since win2000)
• /uni_output (since vista)
• /unique (since win10)