1. > Redirect Output symbols. 2. >> redirect output symbols, but with append functionality. 3. 2> error redirects the output symbol, overwriting the original file contents. 4. 2>> error REDIRECT output symbol, has the function of file content append. 5. * matches any character. 6. ? matches any one character. 7. | pipe symbol. 8. & Background Process character. 9. &&l logic and symbols. Usage: Command 1 && command 2 indicates that if command 1 executes successfully, continue with command 2. 10.| | logical OR symbolic. Usage: Command 1 | | Command 2 indicates that command 1 executes successfully, does not execute command 2, but executes command 2 if command 1 execution fails. 11. Logical non-symbol. Excludes the specified range. 12. [x-y] indicates a certain range. 13. # the comment character. 14. The double quotation mark indicates that it contains the contents as ordinary characters, except for the "$ \" symbols. 15. The single quotation mark indicates that it contains content as a normal character with no special exceptions. 16. $ variable character. 17. \ escape character. 18. ' Inverted quotation marks, indicating what it contains. 19. ; command delimiter. 20. < redirect the input character. 21. () represents the overall execution of the command.
21 special symbols to be transferred under Linux
