What does "| tee -a build.log" do?

What does “| tee -a build.log” do?

This command will display the output in the terminal and also write the output to a file called build.log

Let’s examine each part of the command

| (pipe)
allows the output of one program to be sent to another

tee
split the output to the terminal and to the file

-a
appends the input to the given file(s) instead of overwriting

build.log
is the name of the file to which the input is written

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