>>8029sh-3.2$ ls
-rf .oa
sh-3.2$ rm *.o
rm: illegal option --
usage: rm [-f | -i] [-dIPRrvWx] file ...
unlink [--] file
sh-3.2$ ls *
ls: invalid option --
usage: ls [-@ABCFGHILOPRSTUWabcdefghiklmnopqrstuvwxy1%,] [--color=when] [-D format] [file ...]
sh-3.2$ cat *
cat: illegal option -- r
usage: cat [-belnstuv] [file ...]
sh-3.2$ mv *.o a
mv: illegal option -- r
usage: mv [-f | -i | -n] [-hv] source target
mv [-f | -i | -n] [-v] source ... directory
sh-3.2$