Summary

 To change the group of a file       chgrp newgroupname filename 
 To change the owner of a file       chown newowner filename 
 To change the permissions on a      chmod [u|g|o] [+|-|=] [r|w|x]
 file                                filename 

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 For more information about          See
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 Long file listings                  ls(C) 
 Changing the owner of a file        chown(C) 
 Changing the group of a file        chgrp(C) 
 Changing the permissions on a       chmod(C) 
 file