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Revision 8905

lib/util.sh: added extern ()

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lib/util.sh
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unalias () { builtin unalias "$@" 2>&- || true; } # no error if undefined
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extern () { (unset -f "$1"; "$@") || exit; }
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#### exceptions
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# usage: try cmd...; ignore status; if catch status; then ...; fi; end_try

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