can any1 tell me what -a in unix means.plz see the following code

Posted by randeepsp on Stack Overflow See other posts from Stack Overflow or by randeepsp
Published on 2010-04-15T11:16:35Z Indexed on 2010/04/15 11:23 UTC
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can any1 tell me what -a in unix means.plz see the following code:

if [ "$x" = "$x" -a "y" -eq 0 ] ; then echo $x else echo $y

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