exercise1: 1、cd home touch message.txt su 密码 ls -li /home/wjl/example/message.txt ls -li /home/whl/moveto/ cd example mv message.txt /home/wjl/moveto/ 2、cd .. cd moveto cp -i message.txt /home/ 3、rm -i message.txt y cd .. cd .. rm -i message.txt y

exercise2: 1、mkdir workbench 2、touch workbench/readme.txt 3、vi readme.txt 1 2 3Esc :wq 4、cat readme.txt 5、find /home -name *.txt > /home/workbench/list.txt 6、wc -m home/Workbenchst.txt

exercise3： 1、man ls 2、man man 3、apropos caldendar man cal man calendar man ncal

exercise4: 1、eog *.png 2、find . -name "hiking.png" 3、cd /home/wjl/moveto sudo mv index.png /home/wjl/moveto