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10, ÃüÁîÀúÊ·±£´æÔÚ$HOME/.bash_history ÎļþÖÐ
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12, history -c Çå¿ÕÀúÊ·ÃüÁî
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19, ÈýÖÖ´´½¨ÎļþµÄ·½·¨£ºtouch , >file ,echo >file
20, ls -k ÓÃÓÚÖ¸¶¨´óСÒÔKB Ϊµ¥Î»£¬£­R ÔòÖ¸¶¨µÝ¹éÏÔʾ
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22, cat ÃüÁ¿ÉÒÔÓÃÀ´ºÏ²¢Îļþ eg: cat chap1 chap2 chap3 > usrfile
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