I wonder how do I edit a file inside the putty, because whenever I need to edit the file in error putty
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If it’s a regular text file, you can use nano or vim. Nano is more user friendly for beginners.
Nano:
Vim:
Alternatively you can also use SFTP to edit files: https://www.digitalocean.com/community/tutorials/how-to-use-filezilla-to-transfer-and-manage-files-securely-on-your-vps