Using Bitwise operators:
Check num & (num-1) == 0. If true, the number is a power of 2 else its not.
Check num & (num-1) == 0. If true, the number is a power of 2 else its not.
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negative regexp
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if you want to grep anything except foo, use grep -v or negative lookahead
echo -e 'foo\nbar\nboz'|grep -P '^(?!.*foo).*$' bar boz it is just so
beautiful ...
3 months ago
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