Since macOS is based on Unix there are a number of ways to compress files and folders within the filing system using Unix based application code, below are a few options using the Terminal or command line interface (cli). The default command line application interface in macOS is the Terminal and is stored in /Applications/Utilities.
File and folder compression saves on file size and ensures the contents are captured and delivered or stored as one monolithic file. A compressed file which contains files and folders is generally referred to as an archive. Here are some built-in compression applications you can use including zip, tar, gz, bz2, gz and dmg.
If you're observant enough, you'll see that in the left side panell of Finder you have all the active DMG filesystems listed and ready to be ejected once you finish copying the files or installing new software. Sometimes you may want to download and mount DMG file using Mac OS command line, and in this post I'll show you how to do it. Can I convert a dmg file to iso in terminal? Ask Question Asked 5 years, 4 months ago. To burn the files in /media/image coming from the mount to an iso file. To learn more, see our tips on writing great answers. Sign up or log in. Sign up using Google.
ZIP – Cross Platform
First up is ZIP one of the most commonly used compression techniques used across all platforms
If you want to make a zip without those invisible Mac resource files such as “_MACOSX” or “._Filename” and .ds store files, use the “-X” option in the command so:
TAR.GZ – Cross Platform
Second up is TAR, an old favorite on Unix/Linux – you add the GZ for the compression – compresses tighter than zip
TAR.BZ2 – Cross Platform
A variation on TAR GZ but with better compression than both tar.gz and zip.
Download Dmg File online, free
Without the tar
DMG – macOS Only
This one is macOSnative only – for a GUI interface use /Applications/Utilities/Disk Utility – for command line use:
Open File Terminal
You can also use a number of different formats for creating a .dmg
- UDZO – Compressed image (default)
- UDRO – Read-only image
- UDBZ – Better compressed image
- UDRW – Read/Write image
- UDTO – DVD disk image
That’s the low down, the more common compression packages available will typically be covered in one of the above.
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/System/Library/CoreServices/ BOMArchiveHelper.app opens .zip files,
/System/Library/CoreServices/ DiskImageMounter.app opens the .dmg files.
If you have OnyX, you can try running the 'Reset LaunchServices Database' and 'Reset links between documents and applications' tasks, see if the problem disappears.
Here is a Terminal command you can try if you don't have OnyX (or one of the usual utilities):
-kill -r -domain local -domain system -domain user
Let us know.
Feb 28, 2006 2:06 PM