You opened a system config file in Vim without sudo, made changes, and hit :w to save. Permission denied. Retyping everything isn’t happening. The Solution: :w !sudo tee % From Vim’s normal mode, type: :w !sudo tee % This pipes your buffer through tee running as root: :w — write the current buffer ! —…
Google Drive is a nice cloud storage service. It provides a suite of nice online document spreadsheet and slide editors Google Docs, Google Sheets and Google Slides. The collaborative editing and full history tracking features of Google Docs are excellent. Google Drive gives 16GB free storage which is pretty much larger compared to other free…
To load a kernel module automatically at system startup, create a configuration file in /etc/modules-load.d/ with a .conf extension. The systemd-modules-load.service daemon reads these files during early boot and loads the specified modules. Basic method Create a new configuration file. For the ixgbe driver example: echo “ixgbe” | sudo tee /etc/modules-load.d/ixgbe.conf Or use your editor…
By default, print() writes to STDOUT. Both STDOUT and STDERR go to your terminal unless you redirect them. Here’s how to send output to each stream explicitly. Printing to STDOUT The standard print() function writes to STDOUT and automatically adds a newline: print(“your message”) Printing to STDERR To print to STDERR, pass the file parameter:…
The tee command by default reads from stdin and writes to both stdout and files. To capture only stderr, you need to explicitly redirect it. Basic stderr redirection to tee The straightforward approach is to redirect stderr to stdout, then pipe to tee: command 2>&1 | tee output.log This captures both stdout and stderr. If…
The RTL8192cu is a legacy USB WiFi adapter that’s still in use, but it has known stability issues on modern kernels. If your adapter keeps dropping connections or fails to resume after sleep, you’re likely hitting the same power management bug that affects many devices. Disable power management The most reliable workaround is to disable…
Suppose we have two files, a.txt and b.txt . If we write anything in a.txt & b.txt, it should be redirected to c.txt. tee may help for this purpose. tee: duplicate standard input You may try a command like this: echo “hello” | tee -a a.txt >>b.txt Both a.txt and b.txt will contain the “hello”….
A try like the following command failed $ sudo echo “echo hello” > /usr/local/bin/hello with an message bash: /usr/local/bin/hello: Permission denied It seems the writing to the file is executed under the non-root user. How to redirect STDOUT of sudo command on Linux and write the content to the file (/usr/local/bin/hello here) as root? You…
GDM (GNOME Display Manager) lets you control which users appear on the login screen. You have two main options: hide the entire user list or exclude specific users while keeping the list visible for others. Disable the user list entirely The most straightforward approach is to disable user listing completely. This forces everyone to type…
Insert the installation media and create a mount point: sudo mkdir -p /media/dvd sudo mount /dev/sr0 /media/dvd For a DVD image file instead of physical media: sudo mount -o loop /path/to/image.iso /media/dvd Verify the mount and check that packages exist: ls /media/dvd/Packages/ | head On systems with automatic mounting (systemd-based), the DVD may already be…