Recently, I changed my default file manager from Nautilus to Dolphin in Pop!_OS by this command:

xdg-mime default org.kde.dolphin.desktop inode/directory'

and checked again which is the default file manager by executing this command:

xdg-mime query default inode/directory

and I get this output:

org.kde.dolphin.desktop

But, Gogle Chrome still opens Nautilus as the default file manager. I thought of removing it, but doing so will result in potential damage to my system since it is a built-in file. Here is the picture to view the scenario. And, instantly when I browsed that picture, Chrome, as usual, used Nautilus to browse the picture. Anyway to sort out this issue? I just want to sure that all applications use Dolphin as the default file manager without removing Nautilus. Update: As suggested, I also used xdg-open command to find the default file manager the system is using. And I noticed that, Dolphin opens up automatically with the entered file location.

I often have to use the --exclude-dir to exclude various folders such as .git from the search path. grep -r --exclude-dir=.git --exclude-dir=another_path XXX Then, the command line becomes quite lengthy every time. *Is there a way to make the --exclude-dir options the default, so that grep -r XXX is equivalent to above?* (This is with Ubuntu 24.04 LTS).

When double clicking a file i would like it to open in ghostty terminal emulator with nano i tried putting

EDITOR='nano -x'

and

VISUAL='nano -x'

in the .bashrc file, but does nothing when ghostty is my default terminal. is there a way to achieve that?

Pressing PrnScr "Print Screen" on the keyboard results in a screenshot being silently saved under /home/%user%/Pictures/ How can I change this location?

When I launch Chrome on Linux Mint, it asks for being the default browser. I confirm and it is remembered between browser relaunches. But when I shut my laptop down and then turn on again, default browser is not set anymore. Also, after I press _Set Default_ in Chrome I can see that default browser in _Preferred Applications_ is still unset. But if I set it there it is also persisted until next system restart only.

I'm on Fedora 41 (Gnome 47). I installed Foxit Reader to read PDFs, didn't like it, and uninstalled it. Now, the Detailed Type description in the Files program for all PDF documents is FoxitReader Document. How do I remove this reference to Foxit Reader?

I have a strange problem, I have had it since i installed Debian 12 Bookworm, earlier I was using Debian 8 Jessie and there was not this problem. Every time I open up Nautilus there is no default sorting, at least not show with arrow up or arrow down in the description bar. If i click '*name*' so it sorts by '*name*' ASC, it works in the current folder I'm in, and it can work in next folder also, but some folder can be sorted DESC by '*name*' when I open. I was trying to browse before writing this post to try to find examples on this. When I open up Nautilus, the current directory will be '*/home/username*' with no sorting at least what I can figure, when I then press '*name*' it sorts the folders and files ASC and it shows folders first, like I want it. But when I then click on '*Downloads'* (*/home/username/Downloads*) it the sort by '*last_modified*'. And if I go into '*Documents*' it's sorting it by '*name*' but DESC. I start to go crazy by this, I want every folder to be sorted by '*name*' ASC. gsettings get org.gnome.nautilus.preferences default-sort-order 'name' And: dconf /org/gnome/nautilus/preferences/default-sort-order 'name' I have browser through the whole dconf, and I cannot seem to find any values that is relevant to the this problem. And one more problem I have is that it always show hidden files, even if the *'/org/gnome/nautilus/preferences/show-hidden-files'* is turned off.

I use a Dell XPS 13 laptop with a 4k screen. I only ever use in FHD resolution. Whenever I connect an external screen that I've not used before (this happens surprisingly often), Mint autodetects the new screen, sets it to FHD (good), but sets the built-in screen to 4k (bad) with a user interface scale of 200% (also bad), so I have to access display settings, switch to FHD and do resize many open windows. Not the end of the world, but tedious. Is there a way to tell Mint which resolution and scale to use by default on my built-in screen, i.e. to retain FHD and 100% scale on the built-in display, regardless of the kind of external display I connect? For context: $ inxi -GSC System: Host: ******* Kernel: 6.8.0-51-generic arch: x86_64 bits: 64 Desktop: Cinnamon v: 6.2.9 Distro: Linux Mint 22 Wilma CPU: Info: quad core model: Intel Core i7-8550U bits: 64 type: MT MCP cache: L2: 1024 KiB Speed (MHz): avg: 2000 min/max: 400/4000 cores: 1: 1998 2: 2000 3: 2001 4: 2001 5: 2000 6: 2000 7: 2000 8: 2000 Graphics: Device-1: Intel UHD Graphics 620 driver: i915 v: kernel Device-2: Realtek Integrated_Webcam_HD driver: uvcvideo type: USB Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X: loaded: modesetting unloaded: fbdev,vesa dri: iris gpu: i915 resolution: 1: 1920x1080~60Hz 2: 1920x1080~60Hz API: EGL v: 1.5 drivers: iris,swrast platforms: x11,surfaceless,device API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 24.0.9-0ubuntu0.3 renderer: Mesa Intel UHD Graphics 620 (KBL GT2)

Prompted for a system password on an AntiX Live USB/CD and it's not root...

I am running Linux Mint Debian edition (essentially Debian testing) and the Cinnamon desktop environment. Every time I launch google-chrome it asks to become the default browser. I have told it to do so in all ways I can think of but I still get this pop-up: What I have tried: * Clicking on "Set as default" in the pop-up. * Making chrome the default in its settings: * Using my desktop environment's (cinnamon) settings app to set it as default: * Associating it with all relevant mimetypes in the various ways and files where such things are defined: $ xdg-mime query default text/html chrome.desktop $ grep chrome .local/share/applications/mimeapps.list text/html=chrome.desktop x-scheme-handler/http=chrome.desktop x-scheme-handler/https=chrome.desktop x-scheme-handler/about=google-chrome.desktop x-scheme-handler/about=google-chrome.desktop; text/html=emacs.desktop;google-chrome.desktop;firefox.desktop; x-scheme-handler/http=chrome.desktop; $ grep chrome /usr/share/applications/defaults.list application/xhtml+xml=google-chrome.desktop text/html=google-chrome.desktop text/xml=gedit.desktop;pluma.desktop;google-chrome.desktop x-scheme-handler/http=google-chrome.desktop x-scheme-handler/https=google-chrome.desktop In those files, I replaced all occurrences of firefox (my previous default) with google-chrome. No other browsers are defined anywhere in the file: $ grep -E 'firefox|opera|chromium' /usr/share/applications/defaults.list \ .local/share/applications/mimeapps.list $ * Launching chrome as root in case that helps but it won't let me: * Using Debian's alternatives system to set it as default: $ sudo update-alternatives --install /usr/bin/www-browser www-browser /usr/bin/google-chrome 1080 update-alternatives: using /usr/bin/google-chrome to provide /usr/bin/www-browser (www-browser) in auto mode $ ls -l /etc/alternatives/www-browser lrwxrwxrwx 1 root root 22 Jan 23 17:03 /etc/alternatives/www-browser -> /usr/bin/google-chrome None of these seem to have any effect. Will no one rid me of this turbulent pop-up?

If I launch xterm with its default bitmap fonts and then select the 'Large' font from the 'VT Fonts' menu (via ctrl+right mouse), I get a very usable bitmap font with apparently good Japanese character support. **I'd like to know what this font is** so that I can use it elsewhere. Unfortunately, I've found no information on what default settings XTerm uses (i.e. when none are explicitly specified). Lots of sites show how to use X resources to specify new settings (e.g. particular fonts), but none I've seen say what defaults are used if I do nothing. I've tried eyeballing the font, and it looks similar to and is the same width as 9x15, but it uses more vertical space. It appears not to be 9x15 with different line spacing, though, as specifying this font directly fails to display some Japanese characters that 'Large' can handle just fine. Although I'll be happy to know what this specific font is, I really want to know where to find **what defaults XTerm uses for its resources** more generally. If it makes any difference, I'm running Ubuntu 12.04 LTS, 64-bit. [I have seen [this question](https://unix.stackexchange.com/q/35748/5602) on the subject already, which is why I'm specifically asking about defaults rather than trying to get live values from a running XTerm.]

_2021 update:_ the unexpected behavior described below was actual in KDE Plasma v5.18.5, but isn't actual in 5.22.3 anymore. _2023 update:_ See also [this pull request in KDE's GitLab](https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/3324) for some details about default browser selection in Plasma 6 ([source](https://pointieststick.com/2023/11/17/this-week-in-kde-panel-intellihide-and-wayland-presentation-time/)) . ---- Linux has many ways of "marking" an application "as a default". You can check some of them using following commands: 1. xdg-settings get default-web-browser 2. ls -o /etc/alternatives/*browser* 3. ls -o /usr/bin/*browser* (some of these are symbolic links to the previous list item) 4. xdg-mime query default x-scheme-handler/https 5. grep -E 'https|html' /etc/mailcap 6. If you're on KDE grep BrowserApplication ~/.kde/share/config/kdeglobals I'm having the exact same issue as in question [How do I change the default browser that konsole opens URLs with?](https://askubuntu.com/questions/62182) . I'm running KDE 5.13.5. I did following steps: 1. Uninstall Chromium 2. Make sure all items listed above point to Firefox. 3. Go to "System Settings > Applications > Default Applications > Web Browser" (aka $ kcmshell5 componentchooser) 4. Change setting 'Open **http** and **https** URLs' to "in an application based on the contents of the URL" 5. Click an https link in Konsole 6. Install Chromium 7. Click an https link in Konsole *Actual result*: after step 5, link is opened in Firefox; after step 7—in Chromium. *Expected result*: link is opened in Firefox both in step 5 and in step 7. So KDE decided, that this particular URL ([this one](https://www.linux-apps.com/content/show.php/Redshift+Control?content=170746)) is better suited (see step 4) for Chromium than for Firefox, despite my efforts to mark Firefox as the default browser in six different ways. If in step 4 I choose "in the following application > Firefox", then everything works as expected, but I want to have it set to "in an application based on the contents of the URL", because sometimes the URLs use schemes different from http and https, e.g. mailto URLs in Konsole need to be opened by the email application, without involvement of a browser. Which method of marking a browser as default did I miss? How do I convince KDE that this URL is better suited for Firefox, which I tried to mark as my default browser? P.S. [This Debian bugs mail list thread](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=800502) suggests that Konsole does the same as xdg-open , but for me clicking on URL in Konsole opens Chromium, while xdg-open opens Firefox.

I have a Linux device that utilizes USB gadget for RNDIS support. The goal was to be able to connect any computer this device without having to mess with IP settings. I've set a static IP address on my RNDIS device. As far as communication goes, everything works. What does not work is my host PC seems to add my RNDIS device as a gateway, thus losing internet connection. I can remote the gateway route each time I plug in my device, but this reduces the user experience. How do I modify my RNDIS configuration in order for my host PC to not add a gateway?

I have recently switched to Gnome 3 from Gnome 2 (and switched to Linux recently before that), and Gnome 3 doesn't give me as many options to change settings via the GUI, and especially not to change default settings. Specifically, I'm trying to change the lid close action on my laptop, since I don't want it to suspend on lid close ever. (I changed this for my own user(s) via the gnome-tweak-tool.) I've taken a few unsuccessful stabs. I imagine this has to do with sudo for some user, whether sudo for *root* or *gdm*. I've tried (in a console window in a Gnome session and in an SSH session from a remote machine): > sudo gsettings get org.gnome.settings-daemon.plugins.power lid-close-ac-action 'suspend' > sudo gsettings set org.gnome.settings-daemon.plugins.power lid-close-ac-action "blank" For this, I receive an error about an inability to initialize X11. I've also tried: > sudo -u gdm gsettings get org.gnome.settings-daemon.plugins.power lid-close-ac-action But, this asks for *gdm*'s password, which I've never set. I have continued with passwd, but it tells me: `Cannot unlock the password for gdm'!`` And, I could try forcing an unlock of the user, but this resistance to me indicates that perhaps I should abandon this path. I don't know if each of these warrants its own line of questioning, but in the end, I'm just trying to set the laptop lid close setting (the default for all users), though I'd like to know more generally how to set Gnome's default preferences.

1. Running Debian :

# uname --kernel-name --kernel-release --machine
    Linux 6.5.11-7-pve x86_64
    # cat /proc/asound/cards
    0 [PCH            ]: HDA-Intel - HDA Intel PCH
                        HDA Intel PCH at 0xfb410000 irq 98
    2 [USB            ]: USB-Audio - Scarlett Solo USB
                        Focusrite Scarlett Solo USB at usb-0000:00:14.0-7, high speed

2. Each time I boot, the order of the sound card changes, i.e. USB is randomly 0 or 2 3. How do I make sure USB is the default every time? ## UPDATE1

root@pve:/scripts# cat /etc/modprobe.d/sound/alsa.conf
# makes usb audio always index 0, needs reboot
options snd-usb-audio index=0
options snd-hda-intel index=1
root@pve:/scripts# cat /etc/asound.conf
defaults.pcm.card 2
defaults.ctl.card 2
root@pve:/scripts#

This is what I currently have, but USB can still end up as 2 and I had to use /etc/asound.conf to make it default without performing another reboot and hope it ends up as 0 ## UPDATE2

# cat /etc/modprobe.d/*.conf
# makes usb audio always index 0, needs reboot
#options snd-usb-audio index=0
#options snd-hda-intel index=1
# This file contains a list of modules which are not supported by Proxmox VE

# nvidiafb see bugreport https://bugzilla.proxmox.com/show_bug.cgi?id=701 
blacklist nvidiafb
options zfs zfs_arc_max=13488881664

I am running a LEMP server with Nginx, and have the "listen 80 default_server;" directive enabled for port 80 in the catch all /etc/nginx/conf.d/default.conf directive. When I browse to the url: http://my.servers.ip.address , the server automatically redirects to a page that says > Welcome to nginx! If you see this page, the nginx web server is > successfully installed and working. Further configuration is required. > > For online documentation and support please refer to nginx.org. > Commercial support is available at nginx.com. > Thank you for using nginx. However, in my default.conf file, I only have 'default_server' enabled for port 80, because I don't have a https certificate for my servers IP address. So, When I go to https://my.servers.ip.address , instead of Nginx directing me toward a secure version of the default Nginx Welcome page, it directs me to my first valid virtual hosts https address, giving me a > Connection Is Not Private This website may be impersonating > "my.servers.ip.address" to steal your personal of financial > information. you should go back to the previous page. notice first. What I would like Nginx to do is have a "default_server" option in Nginx's default.conf for "listen 443 default_server;" directive, so that when I go to https://my.server.ip.address in a web browser, it goes to a self signed secure version of the default "Welcome to Nginx!" page, instead of one of my virtual host's domains. So my question is, how do I implement a catch all "default_server" in /etc/conf.d/default.conf for https, using self signed certificates, instead of default.conf redirecting to the https address of my first virtual host? Below is my /etc/nginx/default.conf file. server { listen 80 default_server; server_name _; root /var/www/html/; index index.php index.html index.htm index.nginx-debian.html; location / { try_files $uri $uri/ /index.php; } location ~ \.php$ { include snippets/fastcgi-php.conf; } # A long browser cache lifetime can speed up repeat visits to your page location ~* \.(jpg|jpeg|gif|png|webp|svg|woff|woff2|ttf|css|js|ico|xml)$ { access_log off; log_not_found off; expires 360d; } # disable access to hidden files location ~ /\.ht { access_log off; log_not_found off; deny all; } }

A few days ago I installed a new linux os. Today i realize /root has o+r (755) so EVERYONE is able to see my root sql password in /root/.my.cnf. I freaked out and simply changed /root to 750. My /var/www folder is 2755 but all the folders in it are 2750 (so certain users can browse to the folder without being blind). What software, file permissions and other DEFAULT configuration should I change?

Whenever I open an image in feh, the background is set to the standard, dark gray and gray checkboard pattern like this: **As you can see, it's the checkboard background. How do I permanently change this to black?** I've search Google and other places, but I can't seem to find a straight answer. I'm **guessing feh's config file** is involved, but I can't find any examples of how to do it in the config file. I know you can do it in the command line with --bg-color black *(or something)* but I'd like to just have it set to black by default.

I was trying to use the mimeopen command to open an image file. I ended up being asked to pick the default application of application/x-trash. I was practicing python and thought I should press control c to cancel. Well now the default application of the application/x-trash files is ^c. Now I'm wondering if the that's a bad thing and if so how do I change it back to whatever it was.

I did a screenshot and also saved it, but I'm unable to figure out where it is. Looking into [the official docs](https://docs.xfce.org/apps/xfce4-screenshooter/usage) didn't tell me more and I also didn't find something quickly searching both the SE network and the whole internet. So this Q/A might provide an answer to the next person to be in the same situation. To reproduce run xfce4-screenshooter, select anything and click on Open with a program. I chose *Gnome Paint Drawing Editor*, but this program also didn't (easily) tell me the location of the file. I failed save as but need the file.