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tee

Read from standard input and write to standard output and files (or commands). More information: https://www.gnu.org/software/coreutils/manual/html_node/tee-invocation.html.

Copy standard input to each FILE, and also to standard output:

echo "example" | tee {{FILE}}

Append to the given FILEs, do not overwrite:

echo "example" | tee -a {{FILE}}

Print standard input to the terminal, and also pipe it into another program for further processing:

echo "example" | tee {{/dev/tty}} | {{xargs printf "[%s]"}}

Create a directory called "example", count the number of characters in "example" and write "example" to the terminal:

echo "example" | tee >(xargs mkdir) >(wc -c)