tar Cannot open: File exists
tar: Exiting with failure status due to previous errors
查了一下源目录的属性，发现该目录要求owner,group, others都要有读写和执行权限
再看该目录，原来others没有写权限
#ls -ld .
drwxr-xr-x 2 root root 4096 2011-05-20 10:02 .
按照下面修改就可以了
#chmod 777 .
# ls -ld .
drwxrwxrwx 2 root root 4096 2011-05-20 10:02 .