How do empty my tmp directory?

My tmp directory is at 100% usage and it completely corrupted my databases. My server admin isn't online at the moment so I may have to do it myself; Complete n00b question but can anyone tell me what SSH command to use to empty the tmp directory?

Do I just use "rm"? What should I remove, the entire directory or just all of the contents? is it safe to delete all of the contents inside?

 

 

 

 

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