The 21 special symbols in LINUX-general Linux technology-Linux programming and kernel information. The following is a detailed description. 1.> redirect output symbols.
2.> the redirection output symbol, but the append function is available.
3. 2> the error redirection output symbol overwrites the content of the original file.
4. 2> error redirection output symbol, with the file content appending function.
5. * match any character.
6 .? Match any character.
7. | MPs queue symbol.
8. & background process identifier.
9. & l logic and symbols. Usage: command 1 & command 2 indicates that if command 1 is successfully executed, continue to execute command 2.
10. | logic or symbol. Usage: command 1 | command 2 indicates that if command 1 is successfully executed, command 2 is not executed. If command 1 fails, command 2 is executed.
11. Logical unsigned. Exclude the specified range.
12. [x-y] indicates a certain range.
13. # annotator.
14. "" Double quotation marks indicate that the content contained in it is a common character, except for the symbols ''' $.
15. ''single quotes indicate that the content contained in it is a common character without special exceptions.
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