mksquashfs:tldr:896ab

This command is used to create a squashfs filesystem from one or multiple specified files or directories. Here's the breakdown of each part:

1. mksquashfs : It is the command to create a squashfs filesystem.
2. ${filename_or_directory1 filename_or_directory2 ---} : This is a space-separated list of files or directories that you want to include in the squashfs filesystem.
3. ${filesystem-squashfs}: It is the output filename for the squashfs filesystem that will be created.
4. -regex -e "${regular_expression}": This portion allows you to specify a regular expression to control which files are included in the squashfs filesystem. The regular expression is enclosed in double quotes ("${regular_expression}") and is used in combination with the -regex and -e options.

The regular expression can be used to match filenames based on patterns or specific criteria. Only the files that match the regular expression will be included in the squashfs filesystem. This is useful when you only want to include specific files or exclude certain files from the final squashfs filesystem.

Note: Make sure to replace ${filename_or_directory1 filename_or_directory2 ---}, ${filesystem-squashfs}, and ${regular_expression} with the actual values or paths specific to your situation.