Shulou(Shulou.com)06/01 Report--

Pipe and IO redirection: >

> output redirection: overwrite the output, and the original content will be overwritten

> >: append output, append content at the end of the file

Set-C: prohibit the use of override redirection on existing files

If the output is forcibly overwritten, use > |

Set + C: turn off the above functions

2 >: redirect error output

2 > >: redirect error output by appending method

& >: redirect standard output or error output to the same file

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