gzip: initramfs-2.6.32-431.el6.x86_64.img: unknown suffix -- ignored

gzip 识别.gz 后缀，把原来的文件改名再解压缩即可

例子：

[root@cqhdtest mnt]# file initramfs-2.6.32-431.el6.x86_64.img 

initramfs-2.6.32-431.el6.x86_64.img: gzip compressed data, from Unix, last modified: Tue Apr  5 19:55:55 2016, max compression

[root@cqhdtest mnt]# gzip  -d initramfs-2.6.32-431.el6.x86_64.img 

gzip: initramfs-2.6.32-431.el6.x86_64.img: unknown suffix -- ignored

[root@cqhdtest mnt]# mv initramfs-2.6.32-431.el6.x86_64.img   initramfs-2.6.32-431.el6.x86_64.img.gz

[root@cqhdtest mnt]# gzip  -d initramfs-2.6.32-431.el6.x86_64.img  

[root@cqhdtest mnt]# file initramfs-2.6.32-431.el6.x86_64.img 

initramfs-2.6.32-431.el6.x86_64.img: ASCII cpio archive (SVR4 with no CRC)