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Furthermore, you can safety replace while [ $# -gt 0 ] with while [ "$1" ]

[ is synonymous with test (https://www.unix.com/man-page/OpenSolaris/1/test/) - usually a soft, or a hard link, or internal command:

$ ll /bin/[
-r-xr-xr-x 2 root wheel 63184 18 May 2009...