* &: separate multiple commands on one command line.
* &&: run the command following && only if the command preceding the symbol is successful. `mkdir -p newApp && cd newApp`
* ||: run the command following || only if the command preceding || fails.
An active speaker is simply a device that contains the amplifier and the speaker within the same unit.
There are also other integral devices housed within the unit, such as onboard crossovers and subwoofers.
Command (or Cmd) ⌘
Option (or Alt) ⌥
Control (or Ctrl) ⌃
Cmd-X: Cut the selected item and copy it to the Clipboard.
Cmd-C: Copy the selected item to the Clipboard. This also works for files in the Finder.
Cmd-V: Paste the contents of the Clipboard into the current document or app. This also works for files in the Finder.
Cmd-Z: Undo the previous command. You can then press Shift-Cmd-Z to Redo, reversing the undo command. In some apps, you can undo and redo multiple commands.
Cmd-A: Select All items.
Cmd-F: Find items in a document or open a Find window.
Cmd-G: Find Again: Find the next occurrence of the item previously found. To find the previous occurrence, press Shift-Cmd-G.
Cmd-Tab: Switch to the next most recently used app among your open apps.
Ctrl-Cmd-Q: Immediately lock your screen.
Shift-Cmd-Q: Log out of your macOS user account. You will be asked to confirm. To log out immediately without confirming, press Alt-Shift-Cmd-Q.
Cmd-D: Duplicate the selected files.
Cmd-E: Eject the selected disk or volume.
Cmd-I: Show the Get Info window for a selected file.
Alt-Cmd-L: Open the Downloads folder.
Cmd-Delete: Move the selected item to the Trash.
Command–Mission Control: Show the desktop.
Option–Volume Up: Open Sound preferences. This works with any of the volume keys.
Option–Brightness Up: Open Displays preferences. This works with either Brightness key.
Screenshot Shortcuts
Shift+Command+5: Show snipping tool control panel
Shift+Command+3: Capture the whole screen
Shift+Command+4: Select an area of your screen and take a screenshot
How to rename multiple file names?
On your Mac, select the items, then Ctrl-click one of them.
In the shortcut menu, choose Rename.
In the pop-up menu below Rename Finder Items, choose to replace text in the names, add text to the names, or change the name format.
Replace text: Enter the text you want to remove in the Find field, then enter the text you want to add in the “Replace with” field.
Add text: Enter the text you want to add in the field, then choose to add the text before or after the current name.
Format: Choose a name format for the files, then choose to put the index, counter, or date before or after the name. Enter a name in the Custom Format field, then enter the number you want to start with.
Click Rename
How to reinstall macOS?
Turn on your Mac and continue to press and hold the power button until you see the startup options window.
Click the gear icon labeled Options, then click Continue.
Connect to WiFi by click the wireless icon in the top right corner of the screen
Sreen Capture is uncompressed and requires a lot of bandwidth.
Screen Capture HX allows for smoother video streaming and reduces the strain on your network,
making it a good choice for situations with limited network resources or when streaming over wireless connections.
Here is the detailed information from official website:
Audit mode allows you to make additional changes to the Windows installation before you send the computer to a customer
or capture the image for reuse in your organization.
I have an HP LaserJet MFP M130nw printer bought years ago. We have several laptops in my home that share this printer.
It’s inconvenience to use it by plug/unplug the USB cable every time.
It will be great if everyone can connect it by using wireless network.