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commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Psst. Open beta.
Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
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- » If you wish to use your user account, you will probably need to reset your password.
Terminal - Commands tagged tee - 31 results
If you have some drive imaging to do, you can boot into any liveCD and use a commodity machine. The drives will be written in parallel.
To improve efficiency, specify a larger block size in dd:
dd if=/dev/sda bs=64k | tee >(dd of=/dev/sdb bs=64k) | dd of=/dev/sdc bs=64k
To image more drives , insert them as additional arguments to tee:
dd if=/dev/sda | tee >(dd of=/dev/sdb) >(dd of=/dev/sdc) >(dd of=/dev/sdd) | dd of=/dev/sde
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.
Sends both stdout and stderr to the pipe which captures the data in the file 'out.test' and sends to stdout of tee (likely /dev/tty unless redirected). Works on Bourne, Korn and Bash shells.
When plumbers use pipes, they sometimes need a T-joint. The Unix equivalent to this is 'tee'. The -a flag tells 'tee' to append to the file, rather than clobbering it.
Tested on bash and tcsh.
This is the solution to the common mistake made by sudo newbies, since
sudo echo "foo bar" >> /path/to/some/file
does NOT add to the file as root.
Alternatively,
sudo echo "foo bar" > /path/to/some/file
should be replaced by
echo "foo bar" | sudo tee /path/to/some/file
And you can add a >/dev/null in the end if you're not interested in the tee stdout :
echo "foo bar" | sudo tee -a /path/to/some/file >/dev/null