Tech Tip: Create an Automatically Scrolling Reader

Oct 13, 2011 By Bill Zimmerly

Tech Tips

By combining three useful command-line tools (less, watch and xdotool) along with two xterm windows, you can create an automatically scrolling reader.

Say you have a good book in text-file form ('book.txt') that you just downloaded from Project Gutenberg.

Open one xterm and do the usual thing you do when you want to read that book with less:


$ less book.txt

Look at the first few characters in the title line of that xterm's window. (In mine, it was bzimmerly@zt, which is my user ID and the name of the machine I was working on.)

Open another xterm, issue this command, and watch (pun intended) the magic:


$ watch -n 1 xdotool search --name bzimmerly@zt key ctrl+m

The watch command will (every second) issue a "Return" (Ctrl-m) keystroke to the window that has "bzimmerly@zt" as a title, and it will stop only when you interrupt it with Ctrl-c! I think this is neato daddyo! (What can I say? I'm a child of the '60s!)

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Comments

Scrolling Reader using tabs

Submitted by Richard B (not verified) on Sat, 10/22/2011 - 04:41.

Worked fine for me under using Ubuntu 10.10 (Meerkat), so I tried using tabs - one for the document, a second for the command. Start it then click on the document tab and scrolling starts. To pause it, click on the command tab which then receives (but ignores) the "Return"s. Click the document tab to resume lazy reading.

Note, however, that if you have another terminal window open with the same title line it will send to that.

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