mkdir /tmp/initramfs
#创建测试目录
cp /boot/initramfs-2.6.32-279.el6.i686.img /tmp/initramfs/
#复制/initramfs文件
cd /tmp/initramfs/
file initramfs-2.6.32-279.el6.i686.img
mv initramfs-2.6.32-279.el6.i686.img initramfs-2.6.32-279.el6.i686.img.gz
#修改文件的后缀名为.gz
gunzip initramfs-2.6.32-279.el6.i686.img.gz
#解压缩
file initramfs-2.6.32-279.el6.img
cpio -ivcdu <initramfs-2.6.32-279.el6.i686.img
#解压缩