复制文件

1. 命令一： cp
   time cp -a /home/learn/files /home/learn/test/cp
   real 6m7.699s
   user 0m0.568s
   sys 0m48.372s
2. 命令二：tar
   time (cd /home/learn/files; tar c .) | (cd /home/learn/test/tar ; tar x)
   real 2m7.848s
   user 0m1.209s
   sys 1m12.826s
3. 命令三：rsync
   time (cd /home/learn/files; rsync -a . /home/learn/test/rsync)
   real 9m14.021s
   user 4m8.799s
   sys 3m10.757s
4. 命令四：cpio
   time (cd /home/learn/files; find . -xdev) | cpio -pmd /home/learn/test/cpio
   real 9m23.032s
   user 0m7.435s
   sys 1m35.024s
5. 结论
   

查看文件复制进度（CentOS）

先执行如下两个命令，安装progress

wget --no-check-certificate https://cbs.centos.org/kojifiles/packages/progress/0.13/1.el7/x86_64/progress-0.13-1.el7.x86_64.rpm
rpm -ivh  progress-0.13-1.el7.x86_64.rpm

打开两个终端，在第一个终端执行cp等命令后，在第二个终端执行progress -M -w即可查看cp等命令的执行进度了