1,echo “aa” > test.txt and echo “bb” >> test.txt //> empty the original file and write the content to the file, >> Content is placed at the end of the file
2, chmod go+w -R /home/zhangy //Add permissions to group users and other users
3,tar -tzvf test.tar .gz //List archive content
4,du -ah //View file list size
5,du -sh //View the sum of all file sizes
6, echo ’1+2′
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