squashfs

Create and extract compressed read-only filesystems for Linux

brewmacoslinux

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Compressed read-only file system for Linux

mksquashfsunsquashfs

Create a squashfs image from a directory$ mksquashfs /path/to/directory image.squashfs

Extract a squashfs image to a directory$ unsquashfs -d output_dir image.squashfs

Create a squashfs image with compression options$ mksquashfs /path/to/directory image.squashfs -comp gzip -Xcompression-level 9