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     /boot/initrd     ºËÐĽâ壓縮ËùÐè RAM Disk
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     /etc    ϵͳÏà¹ØÉ趨Îļþ
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     /etc/NETWORKING   Ö»ÓÐYES±êÃ÷ÍøÂç´æÔÚ
     /etc/host.conf Îļþ˵Ã÷Óû§µÄϵͳÈçºÎ²éѯ½ÚµãÃû
     /etc/hosts É趨Óû§×ÔÒѵÄIPÓëÃû×ֵĶÔÓ¦±í
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     /etc/gateways É趨·ÓÉÆ÷
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