When you use the
find command, it searches recursively through each directory each time you request a file. This is slow, as you can imagine. Fortunately, Ubuntu ships with a
cron job that creates an index of all the files on your system every night. Searching this index is extremely fast, which means that if the file you are looking for has been around since the last index, this is the preferable way of searching.
To look for a file in your index, use the command
locate followed by the names of the files you want to find, like this:
matthew@seymour:~$ locate myfile.txt
On a relatively modern computer (say, with at least one processor that runs at 1.5GHz or higher),