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2¡¢ ¶Ô/etc/passwdÎļþ°´ÕÕ¡°:¡±·Ö¸ôµÄµÚÒ»¸ö×Ö¶ÎÅÅÐò£¬²¢Êä³öµÚÈýÐе½µÚÎåÐС£
3¡¢ ±È½ÏÁ½¸öÎļþÊÇ·ñÏàͬ£¨ºöÂÔ¿ÕÐУ©¡£
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dd if=/dev/hda of=/tmp/1g bs=1024 count=$[1024*1024]

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mkdir file0 ......

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mkiso -r -o myiso /dev/cdrom && eject;
or cp /dev/cdrom myiso&&eject

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1. for i in `seq 1 10`; do echo file$i ;done
2. cut -d: -f3,4,5 /etc/passwd | sort -n
3. diff -B file1 file2
5. dd if=/dev/zero of=myfile bs=4096 count=$((1024/4))

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if cmp file1 file2; then echo same ; else echo not same; fi



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