csh under linux maintenance mode history how

Common sense on a regular basis each time the user will be cleared up to see 20 records , I do not know where to set the total feeling of history do not fly under linux , the same account on both machines simultaneously , it seems not remember , even out of the sometimes not remember. duplicate order seems only remember one
cd ..
cd ..
cd ..
last only see a cd ..
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vi .cshrc
 set history=100
 

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nobody know ? ?