1 环境变量篇

1.1  修改 查看 生效 系统环境变量

    1 涉及系统环境变量的文件   -->  .bash_profile

　　　　　　　　　　　　　　 -->　/etc/profile

    2 该文件位置 /root/.bash_profile

    3 文件编辑器打开  vi .bash_profile

    4 文件末尾加入 

                    

JAVA_HOME = /usr/share/jdk 1.6.0PATH = $JAVA_HOME/bin:$PATHCLASS_PATH=.$JAVA_HOME/lib/dt.jar：$JAVA_HOME/lib/tools.jarexport JAVA_HOMEexport PATHexport CLASSPATH5 文件生效       source /root/.bash_profile6 验证环境变量      export JAVA_HOME         echo $JAVA_HOME

 

VI 命令篇章 输入指令 a   退出指令 :q  强退：q!   保存且退出 :wq                                    存成新文件  :w newfile查找指令  : ？____   
     <要查找的单词>
                       /  ____  要查的词           n    finding the dedicate word then moving to the next                N    oppersite direction                :set nu <---show the line number                  :set nonu <---remove line numberdirection :                 k             h   j  linput: i  insert in front of the cursor          a insert behind the cursor         o  insert in the next line of the cursor delete:             x:delete the char of the cursor            X :delete the char of the cursor            dd:delete the current row            5dd:delete the currrent line and the next 5 line            :1,5d delete1 to 5 line            x delete one charactorvi substitute:s /cici/titi         replace the line cici with titi:s/cici/titi/g       replace all the cici with titi in the current line:n,$s/cici/titi    the line n to the last line.each line cici replace with titi:n,$s /cici/titi/g  the line n to the last line.each line cici replace with titi:.,$s/cici/titi     replace all the words in the passages from the first line                      to the last line repalce confirmation command.adding character c behind the comma:s/cici/titi/gc  all the cici replace with titi  + confirmationshow line number :set nudw  delete current words3dw delete 3 wordscopy and attachyw  copy wordy5w copy all 5 wordsyy copy all the line 5yy copy 5 linesp copy after the current line:1,2co3 copy from line1 to line2 after line 3:4,5m6          1          1          2          2          3          3          4          6          5          4          6          5location command              gg moving to the front of the file              G moving to the end of file               :20 moving to line 20              J  merge 2 line              shift + 8 :                             finding the word which is in the position of cursor