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+## $0 can't be assigned this way, and there is no portable alternative.
+
+### Problematic code:
+
+```sh
+#!/bin/sh
+$0=myname
+```
+
+### Correct code:
+
+`$0` can not be changed in a portable way.
+
+### Rationale:
+
+You appear to be trying to assign a new value to `$0` in a `sh` script.
+
+There is no portable way to do this. Write around it, or switch to Bash.
+
+### 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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