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ShellCheck plugin for SonarQube

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Did you mean IFS=$'\t' ?
Problematic code
IFS="\t"

Correct code
IFS=$'\t'

or POSIX:
IFS="$(printf '\t')"

Rationale
IFS="\t" splits on backslash and the letter "t". IFS=$'\t' splits on tab.
Exceptions
It's extremely rare to want to split on the letter "n" or "t", rather than linefeed or tab.
Related resources
See https://github.com/koalaman/shellcheck/wiki/SC1012