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what does this mean?

 
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javac -d ../ankur Please.java

is this statement valid. If yes what does this mean? Please.java will be in the current directory. after -d we specify the directory where we want our class files. but what does ../ankur or ./ankur mean?

what does "." stand for?
 
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. stands for current directory
.. stands for parent directory of current directory
 
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