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++练习1 
+ +1.touch message.txt 
+ +mkdir CFY 
+ +mv message.txt / CFY 
+ +2.cp message.txt / CFY 
+ +3.sudo apt安装rsync 
+ +mkdir空//创建目录空和测试
+ +mkdir测试mv〜
+ +/ message.txt测试
+ +mv〜 /workbench/message.txt test 
+ +rsync --delete-before -d empty / test / // - delete-before接收者在传输之前进行操作，删除empty和test的文件
+ +rmdir empty //删除空目录empty和test 
+ +rmdir测试
+ +
+ +练习2 
+ +1.mkdir workbench 
+ +2.touch workbench / readme.txt 
+ +3.echo -e“1 \ n2 \ n3”> workbench / readme.txt 
+ +4.cat workbench / readme.txt 
+ +5.ls -a home 
+ +命令> workbench / List.txt 
+ +6.wc -m workbench / List.txt
+ +
+ +练习3 
+ +1.man ls 2.man 
+ +man 
+ +3.apropos calendar 
+ +man calendar
+ +
+ +练习4 1. 
+ +找到。-name“ .png” 
+ +2.find。-name“ hiking ”-delete 
+ +3.mv test / .txt data //假设数据和照片分别以txt和陪你过格式存放于测试目录中
+ +mv test / * .png photo