This form of open starts a child process. The return result is the child process ID. Thus, your open(...) || die ... will show the error if the child can't be created. You need to check $? to check for errors from the child. See this for an example of checking for errors in this situation.

In reply to Re^3: Opening not-existing command - Error Handling by Anonymous Monk
in thread Opening not-existing command - Error Handling by Dirk80

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