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fix argument handling #254

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fix argument handling #254

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blastrock
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If the argument is -t, [ -t ] will test if stdout is a TTY. We should
use -z to test if a string is empty instead.

If the argument is -t, [ -t ] will test if stdout is a TTY. We should
use -z to test if a string is empty instead.
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This is correct.

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