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Under /usr/share/man, I see directories as man1,man2,man3...
Why are there such a categorization?
And files under this directories are kept in gz format. Is it like this everytime we call "man blabla", the relevant file is decompressed and after compressed?
Well the categories should be something like this:
1: User Commands
2: System Calls
3: Library Functions
4: Special Files
5: File Formats
6: Games
7: Miscellaneous
8: Administration and Privileged Commands
If they are compressed then they will need to be uncompressed to be able to read the man page. This is done in a temporary location so it doesn't need to compress them again after you are done reading.
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