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Possible Duplicate:
what does crypt(3) and whatnot mean

I'm talking about, e.g. in the git Manual pages, on the git(1) page,

See gittutorial(7) to get started,

or

git-add(1)

Add file contents to the index.

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6

There are different sections of the man pages:

1  General commands
2  System calls
3  C library functions
4  Special files (usually devices, those found in /dev) and drivers
5  File formats and conventions
6  Games and screensavers
7  Miscellanea
8  System administration commands and daemons

git(1) would be explaining the usage of the command, gittutorial(7) would be miscellaneous information.

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