How to check the current system version of Mac computer and macOS operating system upgrade tutorial

Some friends cannot install Apple developer tools command line tools，When installing, it will prompt "The software cannot be installed.，Because it is currently unavailable from the software update server"，Let me teach you how to install it manually。 What are command line tools? Command Line Tools is a small standalone package from Apple，Available for macOS，Expanded the terminal with additional functionality。including but not limited to：svn、git、make、GCC、clang、perl、size、strip、strings、libtool、cpp、what、codesign and many other commands found in Linux。 For ordinary users of macOS，Mainly use its signature function，It is to sign unsigned applications/applications with invalid signatures.。Because Apple’s apps are not signed or have invalid signatures, they will basically crash and fail to run.。 Generally speaking，All you need to do is open the terminal，Then execute xcode-select --install in the terminal and the installer will open.，Then follow the prompts to install it。However, some users will report an error if their network cannot connect to the Apple server.：The software cannot be installed，Because it is currently unavailable from the software update server。 Solved once prompted：The software cannot be installed，Because it is currently unavailable from the software update server，You need to manually go to the Apple Developer Download Center to download the offline installation package of command line tools.。 Open the Apple Developer Center：https://developer.apple.com(The server of Apple Developer Center is not in China，So it will be very slow to open，wait patiently) Click Account on the far right side of the top navigation，Then log in to your Apple ID and open the Developer Download Center：https://developer.apple.com/download/more/ Search for command line tools (press the Enter key after typing in the search box) Select the version suitable for your macOS system。 10.15.x Command Line can be downloaded...

Many new Mac computer users don’t know where the tutorials for using touch gestures are.，I don’t know how to set up my Mac’s trackpad either.。Today I will introduce you to a tutorial on how to use touch gestures on Mac.，Hope it helps everyone。 step one：Open System Preferences 1. Click the Apple icon in the upper left corner of the screen，Select "System Preferences"。 Step 2：Find the trackpad option 1. In the System Preferences pane，Find and click "Touchpad"。 Step 3：View the touch gesture tutorial 1. On the touchpad settings page，Apple will list tutorials for using different gestures。You can click on each gesture to view detailed instructions and demonstration videos。 Step 4：Change multi-gesture settings 1. Click the "More Gestures" option at the top of the trackpad settings page。 2.in the left sidebar，Multi-gesture settings can be changed according to personal needs。 Go through the above steps，You can easily view and set up your Mac's touch gestures。Hope this information is helpful to you。

in macOS，By default，You cannot directly view the size of a folder in Finder's list mode.。But you can follow these steps to set it up，Makes it possible to display the size of folders in a list： 1.Open Finder and go to the folder you want to view。 2.Select "Show" in the menu bar > "Show Options" (or just use the shortcut Command+J)。 3.In the pop-up options window，Check "Calculate all sizes"。 4.Close options window。 Now，You can see the actual size of the folder in Finder's list mode.。It should be noted that，This setting is for a single folder，If you want to show size in other folders，Need to repeat the above steps。

SecureCRT client for Windows，Mac and Linux，It combines rugged and reliable terminal emulation with the powerful encryption of the SSH (Secure Shell) protocol，Extensive authentication options combined with data integrity，Securing network management and end-user access。 The downloaded compressed package contains DMG files suitable for both ARM and INTEL platforms.。Please download and unzip the compressed package and select the corresponding DMG installation according to your Mac system.。