locate a file
there are a number of ways to locate a file. To find a command's binary and other info type [ whereis ] followed by the name of the command you are looking for and you will get a detailed listing.
you can also type [ locate ] followed by the file you are looking for and if it has been added to the database you will get its location.
also you can type [ find ] followed by the path and expression or file/files you are looking for. For example if you want to know how many html files there are in directory stuff do this (in the stuff directory): [ find *.html ] you will get a list of all the .html files in the stuff directory.