如下所示，使用tar -zxvf解压文件时遇到”gzip: stdin: not in gzip format“等错误：

[root@DB-Server tmp]#

[root@DB-Server tmp]# tar -zxvf Percona-XtraBackup-2.2.12-r8726828-el5-x86_64-bundle.tar

gzip: stdin: not in gzip format

tar: Child returned status 1

tar: Error exit delayed from previous errors

最终发现这个压缩包没有用gzip格式压缩，所以不用加z参数，汗颜！

[root@DB-Server tmp]# tar -xvf Percona-XtraBackup-2.2.12-r8726828-el5-x86_64-bundle.tar 

percona-xtrabackup-2.2.12-1.el5.x86_64.rpm

percona-xtrabackup-debuginfo-2.2.12-1.el5.x86_64.rpm

percona-xtrabackup-test-2.2.12-1.el5.x86_64.rpm

You have new mail in /var/spool/mail/root

[root@DB-Server tmp]#