Following the previous post , I apply the application, 7z ( http://www.7-zip.org/ ), instead this time. The reason is obvious: sometimes our work environment might not allow us installing WinRar. The major differences are 7zip doesn't support auto-seed in parameter (in another word, 7zip will replace the file with the same file name because of using "a" in parameter). Therefore, I have to get the "seeds" from current time. 7zip will show the detail during the compressing process (i.e. print out every file name). Thus I use the command script to output the detail into a TXT file, log.txt.