二.tee
(a)sunOS /user/bin
(b)-lc.1 => /usr/lib/libc.so.1.9

-ldl.1 => /usr/lib/libdl.so.1.0

(c)將輸入的訊息(eg字串)讀入,寫進輸出信息(eg螢幕顯示)和檔案裡,

若無此檔案,則建立一個新檔;若有,則複寫.

(d)指令格式 tee [-a] [-i] [--append] [--ignore-interrupts] [--help] [--version] [檔案名稱]
a. -a,-append 不要複寫檔案,直接附加在後面
b. -i, --ignore-interrupts 不理會中斷訊息
C. -help 顯示出相關輔助說明,並跳出

d. -version 顯示指令版本

(e)下一指令 tee test.txt (enter)

this is "tee" program test~~~~ (enter)
this is "tee" program test~~~~
test done (enter)
test done

發現新增一test.txt檔,打開,可看到內容如下

this is "tee" program test~~~~
test done

再下一指令 tee -a test.txt

this is the "append" test (enter)
this is the "append" test

再打開test.txt, 內容變為

this is "tee" program test~~~~

test done
this is the "append" test	(新增了這一行)