Rhcsa notes 5

1. Use tar Command to package, compress and decompress files

Use gzip Compress the file in , And specify the compression name as tar_gzip.tar.gz

Use bzip2 Compress the folder in , And specify the compression name as tar_bzip2.tar.bz2

Use xz Compress the file in , And specify the compression name as tar_xz.tar.xz

New file file1.txt,file2.txt,file3.txt, The file file1.txt and file2.txt, Compress ( Use gzip The way ), exclude file3.txt( That's not right file3 Compress ), And specify the compression name as tar_file.tar.gz

2. establish 3 File test1.txt, test2.txt, test3.txt
  Use find lookup test1.txt,test2.txt, test3.txt

  Use the alias : Name the above command myfind
  Remove alias

 3. View recently used 10 Historical orders

 

4. Execute two commands on one line , Print 123 And from the root Switch to normal user

5. Examples of the use of quotation marks : No quotes , Single quotation marks , Double quotes , The quotation marks ,$()

Single quotation marks ： Anything in it is output as it is , Include $ such

Double quotes ： The variable part inside will be compiled into the corresponding parameter value

Back quotation marks and $()： Store executable command results