Unix: safe if: treat only exit status 1 as false, other non-zero as error

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Peter Schneider
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safe if: treat only exit status 1 as false, other non-zero as error
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(unix.stackexchange.com/users/133282/endlosschleife)EndlosSchleife
(unix.stackexchange.com/users/116858/kusalananda)Kusalananda
(unix.stackexchange.com/users/170373/ilkkachu)ilkkachu
(unix.stackexchange.com/users/240409/austin-hemmelgarn)Austin Hemmelgarn
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