Debian – -bash: auto: command not found

You have a terminal (or terminal emulator) which understands multibyte encodings (probably UTF-8), but a shell which doesn't. Try setting the environment variable LANG to C.UTF-8. Or run locale -a to find another likely value to try.

Section 1 of the BSD Manual is for general commands. Section 2 is for system calls, i.e., function calls you might make if programming for your system in the C language, or one of its derivatives.

The number in parentheses indicates what section of the manual the entry is from. In this case, lstat(2) indicates that this page provides information on a system call, not on a standalone binary which can be executed at the command-line.

If you typed man lstat, you would see the manual page for the lstat system call. stat, by contrast, is the name of both a system call and a standalone utility. If you type man stat, you will by default get the manual page for the command line utility. To see the system call manual page, you would need to explicitly tell man which section of the manual to search:

man 2 stat

https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/manpages.5.html is an (outdated) link listing all the sections of the BSD Manual. The sections will be the same on your system, but I can't find that there is a man page explicitly listing the sections.