In centos, how to switch to default gcc after switched to a higher version of gcc with devtoolset.

["yf chu" <cyflhn@xxxxxxx>]

I want to install several gcc with different versions in centos. The default version of gcc in centos6 is 4.9.3. So I use devtoolset install a higher version of gcc. Then I switch to the higher version of gcc by executing "source /opt/rh/devtoolset-5/enable". But now if I want to switch back to the default gcc, how should I do? 
By the way, is there any solution to install multiple gcc with different versions in centos 5? 




 





 
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