There are many possible reason that you will get "R cannot be resolved to a variable" in eclipse. This post I will list some of them that I have met. 1. Your package has been changed, but not
Installing software in linux is not convenience than in windows. We can get the installation windows by double clicking *.exe files in windows, but this does not work in linux. Yes, we need to use
Create a user or a group in linux is easy, if you are using ubuntu with the lastest edition, you can add user in a friendly UI, but this post will introduce how to add user and group with a series command.
If you want to synchronize time on computer via network in linux, command rdate is a good selection. rdate can query a time-server with RFC-868 proxy. This tip will introduce how to update time in linux
We may get a warning from the complile that "make: warning: Clock skew detected. Your build may be incomplete.". That says we need to change the file timestamp to a correct value. There are two