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Èç¹ûÄãÖ»Ïë¿´ÎļþµÄÇ° 5 ÐУ¬¿ÉÒÔʹÓà head ÃüÁ
È磺head -5 /etc/passwd
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È磺tail -10 /etc/passwd
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sed 's/123/456/g' file.txt > file.txt.new   Ð޸ĵı£´æµ½ÆäËüÎļþ
sed -i 's/123/456/g' file.txt Ö±½ÓÐÞ¸ÄÔ­Îļþ
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vi file.txt
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Àý£ºsed -i 's/\/usr\/local\/apache2\/htdocs/\/var\/www\/html/g' /usr/local/apache2/conf/httpd.conf
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Àý£ºsed -i 's/DirectoryIndex index.html index.html.var/& index.htm index.php /g' /usr/local/apache2/conf/httpd.conf
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echo "abcdefg" | perl -lne '{$a = reverse($_); print $a;}' °ÑÒ»¸ö×Ö·û´®·­×ª
echo bottle|rev °ÑÒ»¸ö×Ö·û´®·­×ª
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1) find . -ctime +3 -exec rm -rf {} \;
2) find ./ -mtime +3 -print|xargs rm -f –r
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1) find /dir -name filename.ext
2) du -a | grep filename.ext
3) locate filename.ext
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rm -f filename/  
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