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 1.6.0
PATH = $JAVA_HOME/bin:$PATH
CLASS_PATH=.$JAVA_HOME/lib/dt.jar：
$JAVA_HOME/lib/tools.jarexport JAVA_HOME
export PATH
export CLASSPATH5 文件生效source /root/.bash_profile
6 验证环境变量export JAVA_HOMEecho $JAVA_HOME
VI 命令篇章输入指令 a 退出指令 :q 强退：q! 保存且退出 :wq存成新文件 :w newfile查找指令 : ？____ <要查找的单词>/ ____ 要查的词n finding the dedicate word then moving to the nextN oppersite direction:set nu <---show the line number :set nonu <---remove line numberdirection :kh j linput: i insert in front of the cursor a insert behind the cursoro insert in the next line of the cursor delete:x:delete the char of the cursorX :delete the char of the cursordd:delete the current row5dd:delete the currrent line and the next 5 line:1,5d delete1 to 5 linex delete one charactorvi substitute
:s /cici/titi replace the line cici with titi
:s/cici/titi/g replace all the cici with titi in the current line
:n,$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 linerepalce confirmation command.adding character c behind the comma:s/cici/titi/gc all the cici replace with titi + confirmation
show line number :set nudw delete current words
3dw delete 3 wordscopy and attachyw copy word
y5w copy all 5 words
yy copy all the line
5yy copy 5 lines
p copy after the current line
:1,2co3 copy from line1 to line2 after line 3
:4,5m61 12 23 34 65 46 5location commandgg moving to the front of the fileG moving to the end of file :20 moving to line 20J merge 2 lineshift + 8 :finding the word which is in the position of cursor
