Redirect output of a command to two different files [duplicate]

Question

I know I can use tee, but I don't want the output to be printed on the screen; I want it to be printed only to the file.

Example:

ls > pk.txt 

Now, another file named praveen should also be created.

Answer 1

Use tee(1) to write to two files and discard stdout:

ls | tee pk.txt praveen >/dev/null

Edit2: As pointed out by Stephane and Thomas, because of how tee works, this is a better version and results in less writes:

ls | tee pk.txt > praveen

Answer 2

With zsh:

ls > file1 > file2

(internally, zsh creates a pipe and spawns a process that reads from that pipe and writes to the two files as tee does. ls stdout is the other end of the pipe).