aleskva's questions

I have a folder symlink to core files and a folder with my improvements like this:

• core/ -> /some/distant/root/directory/core/
  • script_a.py
  • special/script_b.py
  • special/script_c.py
• core-improvements/
  • special/script_b.py

What I want to do is to create third directory called improved-core/ (using bash script), where there is going to be the contents of core-improvements/ and recursively linked contents of core/ (I mean /some/distant/root/directory/core/):

• improved-core/
  • script_a.py -> /some/distant/root/directory/core/script_a.py
  • special/script_b.py (from core-improvements/)
  • special/script_c.py -> /some/distant/root/directory/core/special/script_c.py

If I create it by hand using symlink to script_a.py, script_a.py calls script_b.py from the /some/distant/root/directory/core/special/ directory, not the one in improved-core/special/ directory.

So I suppose the hard links are needed here?

So far I created the following bash script, that works nicely for me, but it creates the symlinks instead of hardlinks:

cp -r core-improvements/ improved-core/ &&
cp -LnrsT core/ improved-core/

Then I tried to create hard links instead of symlinks by switching -LnrsT to -LnrlT, but I get the following errors:

cp: cannot create hard link 'improved-core/script_a.py' to '/some/distant/root/directory/core/script_a.py': Operation not permitted

I'm now completely lost how to solve the issue.

I have some really long and complex command containing both types of quotes: " and ', for example like:

cd folder && command --hel="p_me:'please' anyone:'here?'" ; command2 --end='my:"trouble"'

I want to throw it into the echo command. But it does not work easily, I have to insert it into another quotes and escape some quotes inside the command. This should be okay usually, but unfortunately this time I can not change the command itself (and escape any quotes inside).

How to echo a command containing both types of quotes without its modification? How to escape the quotes on-run for echo?

gedit lately suddenly started to open new files in new windows and it is really frustrating to me. I searched graphical preferences, preferences listed by How to change gedit preferences from terminal? and I also tried to uninstall gedit, remove all gedit files/folders in $HOME and reinstall gedit back, but nothing of that didn't help.

I have some binary I want to run in terminal, but if I run it, it quickly starts to use 100% of both CPUs, 100% of memory and the whole Linux freeze in a few seconds. Also I don't have source (in order to calm it down right from the inside). I googled a lot and found and tried two possible solutions:

1. nice - does literally nothing, the binary still uses 100% of both CPUs and 100% of memory quickly after I run it
2. ulimit -v makes binary and even some other commands (like git) crash and throw some error

Is there any easy solution to limit CPU usage or memory by this binary and let it use e.g. only one CPU or 50% of both CPUs or only some small amount memory? I imagine something like this:

user@linux:~$ magical_command --limitmemory 1M --command mybinary

or:

user@linux:~$ magical_command --cpu both --limitcpu 50% --command mybinary

user@linux:~$ magical_command --cpu one --limitcpu 100% --command mybinary

Update: From the comments below it looks like it is caused by memory rather than CPU overload, therefore I edited the question, but I still recommend @dbkeys' answer for those looking for CPU limiting magical command.

Update 2: As requested in the comments below: if I restart my notebook and only run terminal and that binary from terminal, nothing else, my notebook is significantly slowed down, mouse and keyboard works with delays or jerkily. But the binary is working for hours (most of time downloading and compiling dependencies), therefore I open Chrome and do some other stuff. If I open Chrome and let the binary run in the background, the whole linux freezes at all and nothing, even not mouse responds. I have to push a switch-off buton for 5 seconds to hard shutdown. But I can't just run it and go away, I want to work on some other stuff, therefore I want to limit somehow maybe both, that binary and Chrome.

New versions of Nautilus are cool, because they skip nonalphanumeric letters at the beginning of any file name and sort files according to the first alphanumeric letter (if any). But how to name a file in order to sort it before 0? Assume I have a folder with these files:

0apple.conf
apricot.xml
banana
camel.so
cat.py
dog.tar.bz

and I want to add a one or two letter prefix to the cat.py in order to sort it before 0apple.conf file. I don't want to change the name, just add a prefix. I also don't want to change others' names. I've already tried:

1. #cat.py and .cat.py names and Greek alphabet prefixes sort file to the end (after dog.tar.bz file; . changes also visibility)
2. any of ,-";:-–\_(?)*+%=<>! prefixes sorts the file between camel.so and dog.tar.bz (like without any prefix).

Yes, there is an option to add more zeros to be near the beginning, but I want the file name as shortest as possible and at the very first position.

PS: My language is czech (therefore the collation should be something like cs, cz, czech or cs_CZ).

I sometimes experience whole Ubuntu freezes (from 14.04 to 16.04, I upgrade by a clean installation), just mouse can move (that's why this question is different from others). I think this is caused by one of the cores stop working when 100% load by unresponsive Desktop Environment. There isn't any magic key combination like Ctrl+Alt+Del or Ctrl+Shift+Esc known from Windows. The only thing I could do is hold power button for 5-10 seconds and hard shut down. Is there any other recommended solution?

Could I e.g. with some keyword combination reset CPU or kill all additional services or reset Unity or force soft reboot or I don't know what else could help?

If I create a new ethernet connection, fill in correctly 802.1x security options with correct password and save, it will immediately prompt for password. If I write in correct password once again, it will prompt me again and again, repeatedly. If I close prompt instead of filling in a password and look into a gui option of editing network connection, there is password missing and is missing in /etc/NetworkManager/system-connections/my-connection too. If I fill it into that file, it works as expected.

It doesn't work either on clean installation of Ubuntu 16.04, fully updated installation or even running from USB. In 15.04 everything worked fine.

Is it a bug? Is there any bug filled in for this? If not, could somebody fill in a bug?

If I try to launch Nautilus in whatever way (from Unity, Terminal), it doesn't launch. Terminal gives me these outputs:

launch

name@machine:~$ nautilus

(nautilus:4367): GLib-GIO-ERROR **: Settings schema 'org.gnome.nautilus.preferences' is not installed

Trasovací/ladící past (SIGTRAP) (core dumped [obraz paměti uložen])

launch with sudo

name@machine:~$ sudo nautilus

(nautilus:4672): Gtk-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(nautilus:4672): GLib-GIO-ERROR **: Settings schema 'org.gnome.nautilus.preferences' is not installed

Trasovací/ladící past (SIGTRAP) (core dumped [obraz paměti uložen])

check

name@machine:~$ nautilus -c
running nautilus_self_check_file_utilities
running nautilus_self_check_file_operations
running nautilus_self_check_directory

(nautilus:4689): GLib-GIO-ERROR **: Settings schema 'org.gnome.nautilus.preferences' is not installed

Trasovací/ladící past (SIGTRAP) (core dumped [obraz paměti uložen])

I tried to reinstall Nautilus (with purge), reboot, remove ~/.config/nautilus, step by step at first and then all at once but nothing worked. I haven't changed any configuration or made any significant changes in Ubuntu system since installation. Yesterday Nautilus worked, today doesn't. Does anybody know how to fix it?

I have some music collection and I want to sort/filter them easily according to their cut-off frequency (real bitrate, usually in kHz. I used to use Spek for showing me this information, but Spek doesn't provide any possibility to use it in terminal or for multiple files operations. I've already found some ways, but all of them just list bit-rate in which audio file is saved in kbps, not the actual cut-off frequency in kHz, which I need. I want to find a simple solution to filter the whole collection using e.g bash, python, existing simple tool, etc. Do you know any solution?

Clarification: I'm not looking for bitrate or sampling rate, I'm looking for frequency cut-off!

I have some music collection and I want to sort/filter them easily according to their speed (in tacts per minute). I want to find a simple solution to filter the whole collection using e.g bash, python, existing simple tool, etc. Do you know any solution?

Sometimes I find out that application I'm using at the moment has > (greater than) letter on the left of its icon in Unity Launcher instead of standard triangle. But in Ubuntu Documentation, there isn't this shape mentioned. What does presence of this shape mean?

I want to remove configuration files of a package (the system one at least), but avoid reinstalling the package because of its size. Basically I want to do this

sudo apt-get purge my-gigabyte-package
sudo apt-get --purge autoremove
sudo apt-get install my-gigabyte-package

but without reinstalling the package. I tried

sudo apt-get --purge install my-gigabyte-package
sudo apt-get --purge upgrade my-gigabyte-package
sudo apt-get --purge -f install my-gigabyte-package
sudo apt-get --purge --reinstall install my-gigabyte-package
sudo apt-get --purge check my-gigabyte-package

but as expected none of them worked.

Is there any option, how to achieve this?

Tomorrow is starting the sale of bq Aquaris E4.5 Ubuntu Edition with Ubuntu Touch inside. I consider to buy it, but first I want to ask. In which languages is Ubuntu Phone localized? Is it localized into czech language?

I need to find out just the packages installed for current locales. That packages, which are installed if you open the Language support in the System settings after fresh installation of Ubuntu. They are usually packages installing localized strings and help into the preinstalled packages and also some packages serving localization of Ubuntu.

I found this pretty cool trick how to list manually installed packages and localization packages. But I need just to list the localization ones.

The output of that cool trick looks like:

brackets
build-essential
fluxgui
folder-color
gitg
gnome-paint
google-chrome-stable
hunspell-en-ca
hyphen-en-us
language-pack-gnome-cs
libgmp-dev
libkrb5-dev
libnss3-dev
liboxideqtquick0
libpcap-dev
libreoffice-help-cs
libreoffice-help-en-gb
libreoffice-l10n-en-gb
libreoffice-l10n-en-za
libssl-dev
linux-headers-3.13.0-44
linux-headers-3.13.0-44-generic
linux-image-extra-3.13.0-44-generic
linux-image-3.13.0-44-generic
maxthon-browser-stable
myspell-cs
myspell-en-au
myspell-en-gb
myspell-en-za
mythes-cs
mythes-en-au
mythes-en-us
openjdk-6-jre
openjdk-7-jre
openoffice.org-hyphenation
pipelight-multi
python-requests
thunderbird-locale-cs
thunderbird-locale-en
thunderbird-locale-en-gb
thunderbird-locale-en-us
ttf-mscorefonts-installer
vlc
wbritish
wine1.6
wine1.7
yasm

But I need just these (probably):

hunspell-en-ca
hyphen-en-us
language-pack-gnome-cs
libreoffice-help-cs
libreoffice-help-en-gb
libreoffice-l10n-en-gb
libreoffice-l10n-en-za
myspell-cs
myspell-en-au
myspell-en-gb
myspell-en-za
mythes-cs
mythes-en-au
mythes-en-us
openoffice.org-hyphenation
thunderbird-locale-cs
thunderbird-locale-en
thunderbird-locale-en-gb
thunderbird-locale-en-us
wbritish

somehow automatically. Could you help me please?

I know, that this question was asked and answered too many times, but I tried almost everything and nothing seems to work in any version newer than 39 of Chrome.

Pipelight doesn't seem to work since Chrome removed NPAPI support in version 35, Moonlight was abandoned long time ago and Silverlight running in Wine is not what I need. Could anybody help me to run Silverlight plugin please?