cp使用--一次实现多个文件的拷贝

# 备份文件到当前目录
cp \
/etc/network/interfaces \
/etc/passwd \
/etc/group \
/etc/ssh/sshd_config \
/etc/rc.local \
/etc/sysctl.conf \
/etc/security/limits.conf \
/etc/securetty \
/etc/profile \
/etc/apt/sources.list \
.