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+## $0 can't be assigned in Dash. This becomes a command name.
+
+### Problematic code:
+
+```sh
+#!/bin/dash
+$0=myname
+```
+
+### Correct code:
+
+`$0` can not be changed in Dash.
+
+### Rationale:
+
+You appear to be trying to assign a new value to `$0` in Dash.
+
+Dash does not support 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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