Source: Moeomu’s blog

Cause

I couldn’t download the ed2k link with motrix, so I was going to download a lite version of Xunlei, and suddenly I found a pkg installer, which piqued my interest.

After

Unpacking

• I’ve always wondered what pkg actually runs and what it does, so I started the first step, unpacking
• Unpacking only requires one command: pkgutil --expand the pkg.pkg that needs to be unpacked Custom unpacking folder name.

View

• I found a Res file with no suffix, so I checked the format with file and found that it was compressed, so I uncompressed it with the unar command and came out with a file of the same name, but with a bigger size
• right click in finder - open way - archive utility - app was extracted directly
• Drag this app into /Application and found that it can be used directly, thus completing the task
• Looked at the other files, there is a Unix executable for opening web pages, probably a promotion, no rogue behavior

Result

• Finish the task

Adding

iOS app installer exploration

• After updating the BigSur system, I found that there is such a thing as iOS app installer in the system, but it doesn’t work, so I explored it

I explored it

• Check the location of this software, and check the type, it’s good, generic, means maybe Intel will be supported in the future?

• Open Terminal, go to this folder, run the software, error is reported, suggesting that dependency files are needed, as shown in the picture

• Find the location of the dependency file and find that there seems to be nothing, probably because only the ARM version of the dependency program is available

Parallels Desktop cannot be networked solution

• Still the same problem with BigSur, PD16 is not networked again, so I have no choice but to find a compromise solution
• Run the command sudo -b /Applications/Parallels\ Desktop.app/Contents/MacOS/prl_client_app and it will open PD16, so you will be able to connect to the Internet!
• This command means to run the program with administrator privileges, but in fact, BigSur should have tightened the privileges again, causing problems with PD16 cracking
• You can write this command in a .command file on your desktop, so that you can double-click it to open it

Problem with @ symbol in ls -l

• Recently, I found that some folders/files are marked with the @ symbol, so I wondered what it meant, so I briefly explored it.
• Since this phenomenon is caused by the ls program, I asked the system’s documentation and commanded man ls.
• It was quick, and it came out with a snap, as shown in the picture

1

-@ Display extended attribute keys and sizes in long (-l) output.

• It is very clear that such file/folder has an extended attribute which can be viewed with the xattr -l command
• This attribute can also be cleaned up completely with xattr -c