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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.

Bash quickie] Get a "random" number (larger than zero, within a range) with "shuf" only

Posted 07-31-2014 at 01:16 AM by the dsc (linux-related notes)
Updated 07-31-2014 at 01:39 AM by the dsc (deweirdifying the wording)

It always annoys me when I see things like "cat file | grep pattern | sed ..." when just "sed" would suffice, but I was guilty of using seq only to shuf random numbers when shuf can do it by itself.

shuf -n 1 -i 0-999999999

(apparently the largest number you can get is $((9999**8)) (9999^8 in bash-math), larger than that it gets negative, for some reason )

You also don't need to do some fancy "echo -e" with several...
Posted in Uncategorized
Views 303 Comments 0 the dsc is offline

KDE's "ark" as a command-line universal (un)archiver

Posted 07-28-2014 at 02:44 PM by the dsc (linux-related notes)
Tags ark, zip

For some reason I was having issues with some zip files. "Unzip" wouldn't unzip them, but ark (and perhaps other GUI archivers) would.

Fortunately ark can be used as a command line tool as well, which can be better than needlessly opening the full GUI just to make something so trivial. You still can invoke just the dialog, anyway.

But in order to extract something, for example, one can just use:

ark -b -o ./extantfolder

Posted in Uncategorized
Views 368 Comments 0 the dsc is offline

A clock as the header of Openbox' root menu

Posted 07-15-2014 at 04:15 PM by the dsc (linux-related notes)
Updated 07-16-2014 at 06:35 PM by the dsc (grammar?)

If you want a clock instead of the typical "openbox"-labeled separator at the top of the root menu. The way to do that isn't the most nice and convenient way imaginable, though. Essentially you have the root menu as a pipe menu.

The executed script is just a sed one liner:

 sed "s|INSERT-CLOCK-HERE|$(date +'%-H:%M')|" $HOME/.config/openbox/menu-sed.xml
This a "24 hour" clock format, without leading zeros,...
Posted in Uncategorized
Views 503 Comments 0 the dsc is offline

Bash/command line - minor variable "editing" without sed

Posted 07-14-2014 at 12:38 AM by the dsc (linux-related notes)
Updated 07-14-2014 at 03:02 PM by the dsc

$ a=lilolal ; echo ${a/lal/uuu}
To move files "copied" on clipboard (Konqueror/perhaps dolphin) to the place you're on a terminal, without navigating/browsing the folders on the file manager, one can use:

xsel -b | while read f ; do mv -i "${f#*file://}" ./ ; done

As "copied" files on Konqueror are registered on the clipboard as a list with "file://" preceding the path. Perhaps could be aliased...
Posted in Uncategorized
Views 308 Comments 0 the dsc is offline

Interesting "ask ubuntu" message related to swappiness tweaks

Posted 07-09-2014 at 09:06 PM by the dsc (linux-related notes)


Why most people recommend to reduce swappiness to 10-20?
Because most believe that swapping = bad and that if you don't reduce swappiness, the system will swap when it really doesn't need to. Neither of those are really true. People associate swapping with times where their system is getting bogged down - however, it's mostly swapping because the system
Posted in Uncategorized
Views 478 Comments 0 the dsc is offline


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