man -k who
aix下man不能直接使用需要catman -w创建whatis资料库
aix file types
1.ordinary
2.directory
3.special files
关于i-node
when a user executes a command to axxess a file, they will use the file name. the system then matches the file name with the corresponding i node number.once the i-node number is known,the system will access an i-node table,which holds insformation about the characteristics of the file .examples of what is stored in the i-node table include the user ID of the owner of the file,the type of file,the date the file was last accessed and last modified,the size of the file and the location of the file.once the system knows the location of the file ,the actual data can be located
第二个字段是链接数
mkdir 创建目录
rmdir 删除目录 rmdir /home/team01/test
mkdir -p /结连创建
ls -ldi mydir
istat mydir
touch 命令：
（1）一直跟新这个文件的访问修改时间
（2）建立一个平常文件