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load the OS
init process starts //Ö´ÐÐetcĿ¼ÏµÄÎļþ
execute run level scripts
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execute /etc/rc.d/rc.local
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exit Í˳ö
shutdown ¹Ø»ú time ²ÎÊý ±ØÐëÓÐ
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man shutdowm Ïêϸ½éÉÜ shutdownÃüÁî
--htlp
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ls -l
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mkdir *** ´´½¨Ä¿Â¼
rm -rf *** Ñ­»·É¾³ý Ŀ¼ ºÍĿ¼ÀïÃæµÄÐÅÏ¢
touch 1 ´´½¨ Îļþ //linuxÏÂÎļþµÄºó׺Ãû ûÓÐÒâÒå 
rm -f 1 //Ç¿ÖÆÉ¾³ý
cp 1 2 // ½«Îļþ 1 ¸´ÖÆÒ»·Ý ÎļþÃûΪ2
cp -r d1 d2 //¸´ÖÆÄ¿Â¼ -r ±íʾ Ñ­»·¸´ÖÆ
mv ÒÆ¶¯
vi Îİæ±à¼­Æ÷
vi 3.txt
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a  ¿ªÊ¼ÊäÈë
°´ esc ½øÈëÃüÁîģʽ
 
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dd ɾ³ýÒ»ÐÐ
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o ²åÈëÒ»ÐÐ
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tac ÄæÐòÏÔʾ 
head -3 3.txt ÁгöǰÈýÐÐ
tail -3 3.txt ÁгöºóÈýÐÐ
tail -f ²é¿´ÈÕÖ¾Óà ÁгöиüеIJ¿·Ö
find ²éÕÒÎļþ
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dos Ï¿´»·¾³±äÁ¿ echo %path%
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linux echo $path
ln ´´½¨Á´½Ó
ln 3.txt 4 // Ï൱ÓÚ ¸´ÖÆÒ»·Ý Ô´Îļþ ÔÚ¸´ÖƵÄÉÏÃæ ½¨Á¢ µÄÁ´½Ó
ln -s 3.txt 5//Ï൱ÓÚwindowµÄ¿ì½Ý·½Ê½
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Ìí¼Ó Óû§ useradd testuser
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etc/passwd (¿ÉÒÔÏÔʾ Óû§ÐÅÏ¢)
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bash
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ksh
sh
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