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Linux system prompts "cannot overwrite existing file" solution

  
problem description:
Linux operating system, using the "<" or ">" symbol to redirect content to a file, the system prompts "cannot overwrite existing file" , writing to the file failed.

Analysis:
this situation is due to the system environment noclobber set of options, which will prevent overwriting files redirect.

Solution:
execute "set + o noclobber" command, lifting noclobber option.
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