SquashFS is a type of filesystem that is compressed and read-only. One of the big advantages of SquashFS is its support of various compression methods such as gzip, xz, lzo, lz4, and zstd. In this tutorial, we’ll learn how to mount a SquashFS filesystem for reading. squashfs-root/a squashfs-root/a/b squashfs-root/a/b/c squashfs-root/d squashfs-root/d/e squashfs-root/d/e/f Each time, the source directory is /tmp, but the first time we exclude everything except directory a, and the second time we exclude everything except directory d and d/e. This uses a multi-level exclude file where on each line we exclude The squashfs.img is a SquashFS compressed, read-only, file system holding the Fedora operating system root file system inside another /LiveOS folder containing a rootfs.img file. Mounting the squashfs.img file and listing its file system will show this hierarchy: /LiveOS |- rootfs.img (This contains a filesystem of type ext4. This will extract everything except for files that match *data*.gz in the test directory. The -excludes option tells Unsquashfs to exclude the files on the command line rather than extract them. unsquashfs -ex "test/*data*.gz" ; IMAGE.SQFS test. This uses both extract and exclude options, to tell Unsquashfs to only extract the "test" directory
Remember to replace casper with the directory housing your ISO filesystem.squashfs file. Depending on the speed of your machine, the above command should happen pretty quickly and will end with a report of how many files, directories, symlinks, devices, and fifos were created. How to compress and import the image
Squashfs is a highly compressed read-only filesystem for Linux. It uses zlib compression to compress both files, inodes and directories. Inodes in the system are very small and all blocks are packed to minimize data overhead. Block sizes greater than 4K are supported up to a maximum of 64K. Squashfs is intended for general read-only filesystem
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    • how to open squashfs file