Linux Shell script language learning

  Today I studied Linux Shell for a whole day, therefore I didn't work. I know I shouldn't do this, but for my future, I have no choice. Shell is simple when you  write it begin,but I find it difficult when you study deep. It's a good site for us to learn linux,www.freeos.com. I forgot how i find the site. There is a Linux Shell scrīpt Tutorial--English version, I think it's good for beginner.

Today's scrīpt:   pingall (use pipe,while loop; for loop; redirector)
Question: System variable  MACHINE  ?

  It's long time i didn't study English, I have no confidence for the foreign company's telephone interview. I think this beacause my oral English is still not very fluent. My pronounce is also a problem. Buy the New Concept English for three weeks, i didn't read it so far. I always felt tired, don't like to learn. I know it's excuse for my lazy.

  Labor day we will have 7 free days. I decide go home, hope I would calm.