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Just annotations of little "how to's", so I know I can find how to do something I've already done when I need to do it again, in case I don't remember anymore, which is not unlikely. Hopefully they can be useful to others, but I can't guarantee that it will work, or that it won't even make things worse.
Old

How to fix (possibly) wrong icon appearing for hp-systray

Posted 04-17-2014 at 05:37 PM by the dsc (linux-related notes)

Depending on your DE configurations -- probably if you use KDE or mainly KDE/qt applications (I'm on Openbox, but I have "export DE=KDE" on my autostart for some reason), or perhaps if you use tint2, HP systray applet may show up with non-responsive "stolen" icons from neighbor applications and behave oddly in general.


It's generally set to autorun by there being a file "/etc/xdg/autostart/hplip-systray.desktop". All you got to do is to edit such...
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Posted in Uncategorized
Views 40 Comments 0 the dsc is offline
Old

Gruesome PDF to JPG converter script

Posted 03-28-2014 at 08:57 PM by the dsc (linux-related notes)
Updated 04-10-2014 at 12:11 PM by the dsc (fixing a bug)
Tags pdf

Requires gs, imagemagick, jpegoptim, cpulimit, and "coolloop" (or maybe not).

Has no options or anything.

You run it like:

howeveryounameit.sh appropriate-filename portable-document-file-to-convert.pdf

The result will be:

appropriate-filename-001.jpg, appropriate-filename-002.jpg and so on.

So you don't add numbers or extension on the first parameter ($1). I guess it may not deal well with spaces...
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Posted in Uncategorized
Views 131 Comments 0 the dsc is offline
Old

Ugly script to sleep "accordingly" to CPU temperature, on loops

Posted 03-28-2014 at 08:40 PM by the dsc (linux-related notes)

Sometimes you have a script or one-liner loop thing that may put quite a heavy load on the CPU, that can be at least bothersome due to the noise of the fan, or somewhat worrisome if the temperature approaches or goes beyond what the processor specifications recommend, and yet the system doesn't do anything by itself to avoid it.

One could simply add some arbitrary, constant sleep time within the loop, but that will likely make the whole thing slower than it needs to be. If within...
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Posted in Uncategorized
Views 86 Comments 0 the dsc is offline
Old

Give a default/non-null value in order to avoid the "unary operator expected" error

Posted 02-19-2014 at 03:00 PM by the dsc (linux-related notes)
Tags bash

Quote:
Originally Posted by cfajohnson
Quote:
i am trying to compare a value with value 50. but i am getting
"[: -lt: unary operator expected"

I am using

if [ $j -lt 50 ]
then
echo "------------"

fi
Make sure that $j expands to a value. Best is to set it explicitly, but you can also give it a default value (0 in this example):


Code:
if [ ${j:-0} -lt 50 ]
http://www.unix.com/302295072-post3.html...
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Posted in Uncategorized
Views 144 Comments 0 the dsc is offline
Old

"Alpha" of an auto-renaming existing files "mv" script/function/alias

Posted 02-18-2014 at 01:02 PM by the dsc (linux-related notes)

Please don't test this on files you don't care to lose/folders you don't care to mess. I just tested once with an explicit (non-variable/"$2") destination, it seems to have worked. I don't have it as an alias or anything, it was just an "one liner" I came up with.

Code:
for on in "$1" ; do nn=$on ; num=1 ; until [ ! -f "$2/$nn" ] ; do nn="$(echo $nn | sed 's| ([0-9]*)||' | sed "s|\.| ($num).|")" ; num=$((num+1)) ; echo $nn ; done
...
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Posted in Uncategorized
Views 130 Comments 0 the dsc is offline

  



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