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    ## compare_shells: dash bash mksh zsh
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    #
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    # Tests for the blog.
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    #
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    [ -a ]
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    echo status=$?
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    ## stdout: status=0
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    [ -a -a ]
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    echo status=$?
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    ## stdout: status=1
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    [ -a -a -a ]
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    echo status=$?
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    ## stdout: status=0
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    ## BUG mksh stdout: status=2
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    [ -a -a -a -a ]
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    echo status=$?
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    ## STDOUT:
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    status=1
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    ## END
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    [ -a -a -a -a -a ]
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    echo status=$?
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    ## stdout: status=1
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    ## BUG dash/zsh stdout: status=0
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    [ -a -a -a -a -a -a ]
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    echo status=$?
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    ## STDOUT:
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    status=2
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    ## END
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    ## BUG dash/zsh STDOUT:
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    status=1
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    ## END
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    [ -a -a -a -a -a -a -a ]
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    echo status=$?
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    ## STDOUT:
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    status=1
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    ## END
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    ## BUG dash/zsh STDOUT:
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    status=0
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    ## END
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    [ -a -a -a -a -a -a -a -a ]
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    echo status=$?
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    ## stdout: status=1
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