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ShellCheck plugin for SonarQube

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Trapping signals by number is not well defined. Prefer signal names.
Problematic code
trap myfunc 28

Correct code
trap myfunc WINCH

Rationale
Signal numbers can vary between platforms. Prefer signal names, which are fixed.
Signal numbers 1, 2, 3, 6, 9, 14 and 15 are specified as parts of the optional POSIX XSI and ShellCheck will not warn about these.
Exceptions
None.