$0
#!/bin/sh $0=myname
$0 can not be changed in a portable way.
You appear to be trying to assign a new value to $0 in a sh script.
sh
There is no portable way to do this. Write around it, or switch to Bash.
If you instead wanted to compare the value of $0, use a comparison like [ "$0" = "myname" ].
[ "$0" = "myname" ]
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