tee

Read from stdin and write to stdout and files (or commands). More information: https://www.gnu.org/software/coreutils/tee.

echo "example" | tee path/to/file

echo "example" | tee -a path/to/file

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

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