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開工--行勝於言，開工--勝於

0.0 開此Blog主要目的在於開始學習linux內核，入手書籍《鳥哥的Linux私房菜》第三版，目前看到250頁有余，立此Blog督促自己更正拖延症，及學會如何思考。
0.1 此篇隨筆摘錄之前所學的一部分知識，摳腳英語表達，此後的隨筆加以更正，但同樣附以扎腳英文。
1.[deer4ever_lix@localhost ~]$ ：中的～符號表示/home/deer4ever_lix（PWD命令予以顯示--print working Directory)：$表示的是非root權限：#為root權限
2.learn how to create a new directory&file in this dir。
--using："mkdir"to create dir,the"touch"to create file.
eg. root@localhost#: cd /tmp:
           #: mkdir testing
           #: chmod 774 testing
           #:touch testing/testing
you cannot see any files in temp doc,cause you make the root manage this "testing" dir. so you could using the "chown" to change the owner root.
3.You know how to create a new file,but you must know the soulutions you can use to delete the files."rm"in liux is a good soulution in deleate it.(Some troubles will happen if you use rm,It's necessary to man rm ><.)
4.Path & Dir,you can use "-"to return to the laster dir or path,you can use "~"to point to the current path.so,it is a great tools to use cd -,cd ~
and,you must know "pwd"means to show the path you are in now.
mkdir & rmdir are also useful to create and deleate the files and dirs.
5.the difference between use "ls -ld" and use "ls -l":eg. you input $ ls -ld the window will print the info of current path,but if you input $ ls -l
the window will print the detailed info about all the docs in this path.
6.It's important to create the bak for the files you want to cp,it is priceless when you need the former files.(when I install the stardict,I got it.)
7.One day,you want to find or search for a file you need.you can use these command.eg.num1,"which" is a good choice,so you can input which ls in the termnal,num2,you can also use "find" and "whereis" or "locate".
8.You can use the"free" command to display the amount of free and used memory or swap in your system.
9.You know how to lookat the room you use or free about your dir and files,so you can use the "du"=disk usage to search for the each files in your disk and add it.but the"df"=disk free just search it use the fs=file system.so if your os(operating system) cannot release the room you delete,the date will greater than the du get.
10.The fs(filesystem) of Ext2 include num1.bootsector num2.superblock num3.inode bitmap num4.block bitmap num5.inodetable num6.datablock.