Glossary:
- Standard input ( stdin ): input on the keyboard to pass information to the computer. File descriptor ---> 0
- Standard correct output ( stdout ): the correct output on the screen to pass information to people. File descriptor ---> 1
- Standard error output ( stderr ): the error output on the screen , to pass information to people. File descriptor ---> 2
Related symbols:
- ">", "1>": The standard correctly overrides the redirection, which will overwrite the original content in the file.
- "2>": Standard error overrides redirection, which will overwrite the original content in the file.
- "&>": The standard correct and error overrides are redirected together, which will overwrite the original content in the file.
- ">>", "1 >>": Standard correct append redirection will append information to the end of the file.
- "2 >>": standard error append redirection, appending information to the end of the file.
- "<": Standard input.
1. Write a simple script file and run it.
2. "1>" standard correct override redirection, "2>" standard error override redirection, "&>" standard correct, error override redirection together, will overwrite the original content in the file.
3. "1 >>" standard correct append redirection, "2 >>" standard error append redirection, will append the information to the end of the file (it will not overwrite the content in the original file ).
