Ubuntu – How to both display a command line’s output on console and save the output into a text file

The redirection operator command > file will redirect the STDOUT of a command, or STDERR of a command if used like command 2> file or both if used like &> in bash or in any shell by portable command > file 2>&1 way. I am not aware of any direct method using redirection that can achieve what you need.

Although it is possible using the script program. It will basically save everything printed on the terminal in that script session.

From man script:

script makes a typescript of everything printed on your terminal. 
It is useful for students who need a hardcopy record of an 
interactive session as proof of an assignment, as the typescript file 
can be printed out later with lpr(1).

You can start a script session by just typing script in the terminal, all the subsequent commands and their outputs will all be saved in a file named typescript in the current directory. You can save the result to a different file too by just starting script like:

script output.txt

To logout of the screen session (stop saving the contents), just type exit.

Here is an example:

$ script output.txt
Script started, file is output.txt

$ ls
output.txt  testfile.txt  foo.txt

$ exit
exit
Script done, file is output.txt

Now if i read the file:

$ cat output.txt

Script started on Mon 20 Apr 2015 08:00:14 AM BDT
$ ls
output.txt  testfile.txt  foo.txt
$ exit
exit

Script done on Mon 20 Apr 2015 08:00:21 AM BDT

script also has many options e.g. running quietly -q (--quiet) without showing/saving program messages, it can also run a specific command -c (--command) rather than a session, it also has many other options. Check man script to get more idea.

Normally, I would advise that you use a proper HTML parser to parse HTML.

However, this data looks pretty straightforward: using a double quote (optionally followed by "v") as the field separator, grab the 2nd field of each line. Then join the pieces with commas

result=$( grep ... file.html | awk -F'"v?' '{print $2}' | paste -sd, )
echo "http://x.y.z/$result.mp3"