tee

tee [options] [files]

Duplicate the standard input; send one copy to standard output and another copy to files.

Options

-a

Append output to files.

-i

Ignore all interrupts.

Examples

Display a who listing on the screen, and store it in two files:

who | tee userlist ttylist

Display misspelled words, and add them to existing typos:

spell ch02 | tee -a typos