How to find where which is.

[dos2unix]

There are handy commands for finding out where things are on your Linux systrm.

which, whereis, locate. and find.

find will find just about any file. But you have to know at least part of the name.
Because it does the search in real time, it can take a few seconds to return the results.
It also works best if you know the path. You don't need the whole path, the more you know the
faster it works because the search is narrowed down.
Find works like this.

find /path/to/search -name "filename"

example

find /home/user -name "*.txt"

locate works a litle differently, it uses a mini-database to find where files are.
It's faster than find, but only works if the file is in the database. Many rpm, deb and other packages
will sometimes put the command in the database when they are installed. The default commands
are usually already there. It has been my experience that binaries installed using snap, appImage and
flatpak are generally not added to the database.
Using locate is pretty straight forward also

locate myfile.txt

to update the locate database

sudo updatedb

which is generally for only finding executable binary files in your $PATH.
It's not really for text files in your home directory.
How to use which.

which command

example

which python

whereis is kind of like which in that it's mostly for binaries in your $PATH, however it gives a little
more information than which. It will tell where the binary is, the source code (if you have it loaded as a package)
and where the man pages are.
How to use whereis.

whereis command

example

whereis gcc