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head/tail:
¡¡¡¡## (1) displays the first 6 lines of a file
¡¡¡¡head -6 readme.txt
¡¡¡¡## (2) displays the last 25 lines of a file
¡¡¡¡tail -25 mail.txt
¡¡¡¡## (3) display the file from 11 to 20 
¡¡¡¡head -20 file | tail -10
tail -f Ë¢ÐÂÏÔʾ
 
 
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ÊÇ·ñ°²×° rpm -e (–nodeps) Èí¼þ°ü
 
 
 
 
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history|less
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du --max-depth=N -h(--human-readable)
du -a(all)b(bytes) = ll
 
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fdisk -l = fdisk /dev/sda1 ->p
df
 
 
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ps -ef|grep httpd|wc -l
ps -auxf
 
 
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netstat -an|grep -i "80"|wc -l
 
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      dig yahoo.com a +noall +answer
      ²éÕÒyahoo.com mx¼Ç¼µÄÁÐ±í£º
      dig yahoo.com mx +noall +answer
      ²éÕÒyahoo.comµÄȨÍþdns£º
      dig yahoo.com ns +noall +answer
      ²éѯÉÏÃæËùÓеļǼ£º
      dig yahoo.com any +noall +answer
 
 
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find -anewer
    (touch -d xx)
find -exec commond "{}"
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