1.touch message.txt mkdir CFY mv message.txt /CFY 2.cp message.txt /CFY 3.sudo apt install rsync mkdir empty //创建目录empty和test mkdir test mv ~/message.txt test 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 test

exercise 2 1.mkdir workbench 2.touch workbench/readme.txt 3.echo -e"1\n2\n3">workbench/readme.txt [图片]4.cat workbench/readme.txt 5.ls -a home command >workbench/List.txt 6.wc -m workbench/List.txt

exercise 3 1.man ls 2.man man 3.apropos calendar man calendar

exercise 4
1.find . -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test目录中 mv test/*.png photo