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This is a bug in older versions of bash, specifically 4.0 β2 patchlevel d to 4.0 patchlevel m. From the changelog from 4.0 to 4.1 α: n. Fixed the behavior of set -u to conform to the latest Posix interpretation: every expansion of an unset variable except $@ and $* will cause the shell to exit. This behavior was introduced in 4.0β2 because the previous (and now again current) behavior was ...
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