cat /path/to/some/file.txt | tee /dev/pts/0 | wc -l

Both view and pipe the file without saving to disk

This is a cool trick to view the contents of the file on /dev/pts/0 (or whatever terminal you're using), and also send the contents of that file to another program by way of an unnamed pipe. All the while, you've not bothered saving any extra data to disk, like you might be tempted to do with sed or grep to filter output.

2
By: atoponce
2009-11-07 22:24:28

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What Others Think

Use '/dev/tty': it was designed for this purpose. The device 'tty' always points to the process' controlling terminal device. In your example, /dev/tty would internally point to /dev/pts/0.
arcege · 445 weeks and 2 days ago
Ahh, I didn't know that. That's good to know. Also, after posting this, I realized later that I'm using 'cat' when I don't need to. Rather: tee /dev/tty < /path/to/some/file | wc -l would be more appropriate.
atoponce · 445 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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