Linux and Unix tee command
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About tee
Syntax
Examples
Related commands
Linux and Unix main page
Read from an input and write to a standard output and file.
tee [OPTION]... [FILE]...
| -a --append | Append to the given FILEs, do not overwrite. |
| -i | ignore interrupt signals. |
| --help | Display the help screen. |
| --version | Display the version. |
ls *.txt | wc -l | tee /dev/tty count.txt
In the above example the ls command would list all .txt files in the current directory, take a word count (wc) by the amount of lines (-l) and the output displayed to the /dev/tty (terminal) will be sent to the count.txt.
Note: Because the above example did not take advantage of the -a or append option if the count.txt file already existed it would have been overwritten.