SSH Completion

I use a number of different machines during my average day, many of those via ssh. I have a hard time remembering what the creds are for each of the machines so a long time ago I learned to use an .ssh/config file to keep track of the info. I also used to enjoy tab completion with ssh to find all the servers depending on context (e.g. home-www, home-fw, work-test1, etc) but, on RHEL 6 workstation, I didn’t have tab completion with ssh. Finally got around to looking at why and discovered a handy package in epel: bash-completion. Wow, lots and lots that I was missing (and, didn’t have to build for myself).

Check out EPEL. Once you have EPEL set up, then: sudo yum install bash-completion
Or for details see the package page (technically a noarch, this just happens to be the x86_64 link).

If you want to get in to writing your own, check out this article. The article is written about Debian but bash (or, potentially zsh) is what does the heavy lifting so it should be pretty x-distro. Please leave anything cool you make in the comments.

My sound broke on RHEL 6

Not sure what I did (I suspect it had something to do with rebooting while docked), but my laptop sound (and mic, I think) stopped working again. Unfortunately, this is one of those things that happens rarely enough that I can’t ever remember what to do about it. I usually go through the obvious on the little GUI sound prefs panel (twiddle output devices, test speakers, etc) which, in many cases, is sufficient to kick it back to working. However, that didn’t work for this one, so I did some googling and found a bunch of handy things. However, the one that really worked was http://fedoraproject.org/wiki/How_to_troubleshoot_sound_problems. In particular, going to the command line and running the alsamixer (alsamixer -c 0) which, for some reason, always shows me the actual output device that has magically gotten muted.