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IF -a condition meaning.

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IF -a condition meaning..
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Old Unix and Linux 10-30-2013   -   Original Discussion by abhi_123
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Note: -a may happen to be supported for historical reasons, however, it is not part of POSIX so -e should be used instead.

An early proposal used the KornShell -a primary (with the same meaning), but this was changed to -e because there were concerns about the high probability of humans confusing the -a primary with the -a binary operator.
test: Rationale
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