postIt » device https://lakm.us/postit Post-It sticky notes with PasteBin sense Thu, 02 Jan 2025 01:33:57 +0000 en-US hourly 1 http://wordpress.org/?v=4.0.18 Checking whether /dev/video0 or /dev/tty … https://lakm.us/postit/2012/01/checking-whether-devvideo0-or-devtty/ https://lakm.us/postit/2012/01/checking-whether-devvideo0-or-devtty/#comments Tue, 10 Jan 2012 06:39:59 +0000 http://xp-racy.lan/postit/?p=139 Checking whether /dev/video0 or /dev/ttyUSB0 exists or not (module is installed & probed). They're recognized as "character special file" in bash

[ -b /dev/ttyUSB0 ] && echo "char special file found" || echo "char special file not found"

Compare the above to "block special file"

[ -b /dev/sda ] && echo "block special file found" || echo "block special file not found"
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