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+## $0 can't be assigned in Ksh (but it does reflect the current function).
+
+### Problematic code:
+
+```sh
+#!/bin/ksh
+$0=myname
+echo "Usage: $0 --help"
+```
+
+### Correct code:
+
+```sh
+#!/bin/ksh
+myname() {
+  echo "Usage: $0 --help"
+}
+myname
+```
+### Rationale:
+
+You appear to be trying to assign a new value to `$0` in Ksh.
+
+This is not possible. However, `$0` will reflect the current function name, so if you wrap your code in a function with your chosen name, you can have `$0` expand to it.
+
+### Exceptions:
+
+If you instead wanted to compare the value of `$0`, use a comparison like `[ "$0" = "myname" ]`.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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