SC3048 – ShellCheck Wiki

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In POSIX sh, prefixing signal names with 'SIG' is undefined.

(or "In dash, ... is not supported." when using dash)

Problematic code:

trap 'handle_interrupt' SIGINT

Correct code:

trap 'handle_interrupt' INT

Rationale:

POSIX does not allow specifying the "SIG" prefix of a signal name like "INT". Bash and Ksh supports this as an extension.

Simply remove the "SIG" from the signal name.

Exceptions:

None

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