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https://www.cyberciti.biz/faq/get-octal-file-permissions-from-command-line-on-linuxunix/

I am a new Linux command line user. How do I find file permissions in octal format such as 0644 from the bash command line running on a Linux or Unix operating systems? How can I get the octal permissions for a file? How do I get octal file permissions on Linux/Unix?