How to view linux environment variables

The key to installing dual systems in Linux and Windows is partitioning and boot settings. 1. Preparation includes backing up data and compressing existing partitions to make space; 2. Use Ventoy or Rufus to make Linux boot USB disk, recommend Ubuntu; 3. Select "Coexist with other systems" or manually partition during installation (/at least 20GB, /home remaining space, swap optional); 4. Check the installation of third-party drivers to avoid hardware problems; 5. If you do not enter the Grub boot menu after installation, you can use boot-repair to repair the boot or adjust the BIOS startup sequence. As long as the steps are clear and the operation is done properly, the whole process is not complicated.

The key to enabling EPEL repository is to select the correct installation method according to the system version. First, confirm the system type and version, and use the command cat/etc/os-release to obtain information; second, enable EPEL through dnfinstallepel-release on CentOS/RockyLinux, and the 8 and 9 version commands are the same; third, you need to manually download the corresponding version of the .repo file and install it on RHEL; fourth, you can re-import the GPG key when encountering problems. Note that the old version may not be supported, and you can also consider enabling epel-next to obtain the test package. After completing the above steps, use dnfrepolist to verify that the EPEL repository is successfully added.

Newbie users should first clarify their usage requirements when choosing a Linux distribution. 1. Choose Ubuntu or LinuxMint for daily use; programming and development are suitable for Manjaro or Fedora; use Lubuntu and other lightweight systems for old devices; recommend CentOSStream or Debian to learn the underlying principles. 2. Stability is preferred for UbuntuLTS or Debian; you can choose Arch or Manjaro to pursue new features. 3. In terms of community support, Ubuntu and LinuxMint are rich in resources, and Arch documents are technically oriented. 4. In terms of installation difficulty, Ubuntu and LinuxMint are relatively simple, and Arch is suitable for those with basic needs. It is recommended to try it first and then decide.

The steps to add a new hard disk to the Linux system are as follows: 1. Confirm that the hard disk is recognized and use lsblk or fdisk-l to check; 2. Use fdisk or parted partitions, such as fdisk/dev/sdb and create and save; 3. Format the partition to a file system, such as mkfs.ext4/dev/sdb1; 4. Use the mount command for temporary mounts, such as mount/dev/sdb1/mnt/data; 5. Modify /etc/fstab to achieve automatic mount on the computer, and test the mount first to ensure correctness. Be sure to confirm data security before operation to avoid hardware connection problems.

The way to set environment variables in Laravel is to use the .env file, store the variables in a hidden file at the root of the project, and access them through the env() function; but to ensure compatibility with the configuration cache, you should use env() in the configuration file and use config() in the application code to call the variables. The specific steps are as follows: 1. Define variables such as APP_DEBUG=true in the .env file; 2. Read variables using env('APP_DEBUG'); 3. Create config/app.php file and reference environment variables; 4. Call in the application through config('app.debug_mode'); 5. Use phpartisanco

Logs in Linux systems are usually stored in the /var/log directory, which contains a variety of key log files, such as syslog or messages (record system logs), auth.log (record authentication events), kern.log (record kernel messages), dpkg.log or yum.log (record package operations), boot.log (record startup information); log content can be viewed through cat, tail-f or journalctl commands; application logs are often located in subdirectories under /var/log, such as Apache's apache2 or httpd directory, MySQL log files, etc.; at the same time, it is necessary to note that log permissions usually require s

Have problems uploading files in Google Chrome? This may be annoying, right? Whether you are attaching documents to emails, sharing images on social media, or submitting important files for work or school, a smooth file upload process is crucial. So, it can be frustrating if your file uploads continue to fail in Chrome on Windows PC. If you're not ready to give up your favorite browser, here are some tips for fixes that can't upload files on Windows Google Chrome 1. Start with Universal Repair Before we learn about any advanced troubleshooting tips, it's best to try some of the basic solutions mentioned below. Troubleshooting Internet connection issues: Internet connection

sudo stands for "substituteuserdo" or "superuserdo", allowing users to run commands with permissions of other users (usually root). Its core uses include: 1. Perform system-level operations such as installing software or editing system files; 2. Accessing protected directories or logs; 3. Manage services such as restarting nginx; 4. Modify global settings such as /etc/hosts. When using it, the system will check the /etc/sudoers configuration and verify the user password, provide temporary permissions instead of continuously logging in as root, ensuring security. Best practices include: only when necessary, avoid blindly executing network commands, editing sudoers files with visudo, and considering continuous operations.