Created SC3065 (markdown)

SC3065.md

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+## In POSIX sh, test -k is undefined.
+
+### Problematic code:
+
+```sh
+if [ -k file ]
+then
+  echo "File has sticky bit set"
+fi
+```
+
+### Correct code:
+
+```sh
+if [ -n "$(find file -prune -perm /1000)" ]
+then
+  echo "File has sticky bit set"
+fi
+```
+### Rationale:
+
+`test -k file` and `[ -k file ]` are not defined by POSIX. To ensure compatibility with all target systems, use `find` instead.
+
+### Exceptions:
+
+None. If you are targeting a shell that supports `test -k`, specify it in the shebang.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!