tee

Additional Notes

tee is a shell command used to read standard input and write it to files and standard output. It splits a command's output so you can see it on screen and save it to a file simultaneously.

Use -a to append to files instead of overwriting. tee is often used with sudo to write to protected files: command | sudo tee file.

Syntax

tee [arguments]

Parameters

• options: Flags that change how tee behaves.
• arguments: Values consumed by the shell builtin or script command.
• command: Command line to run, test, wrap, or control.

Common Options

• -a: Append to files instead of overwriting.
• -i: Ignore interrupt signals.

Examples

echo "hello" | tee output.txt
make | tee build.log
echo "line" | sudo tee -a /etc/example.conf

Practical Notes

tee is useful when you want to see command output and save it at the same time.