sqfstar:tldr:d397a

This command is a combination of two commands, xzcat and sqfstar, using the pipe (|) symbol to pass the output of xzcat as input to sqfstar.

Here is a breakdown of each part of the command:

1. xzcat: xzcat is a command used to decompress (uncompress) files that have been compressed using the xz compression algorithm. It takes a single argument, which is the path to a compressed file in the xz format. In this command, ${archive-tar-xz} represents the variable holding the path to the compressed file.

2. |: The pipe symbol, |, is used to connect the output of one command to the input of another command. In this case, it is used to take the output of xzcat and pass it as input to sqfstar.

3. sqfstar: sqfstar is a command used to create a SquashFS filesystem from a list of files. It allows you to specify multiple files as arguments, which will be included in the resulting SquashFS filesystem. The first argument after sqfstar is the path to the SquashFS filesystem that will be created. ${filesystem-squashfs} represents the variable holding the path to the output SquashFS filesystem. Following that, ${file1 file2 ---} represents multiple files that will be included in the SquashFS filesystem. You can specify additional files as needed.

So, in summary, this command decompresses the xz compressed file specified by ${archive-tar-xz} using xzcat, and then passes the resulting uncompressed data to sqfstar along with the path to the output SquashFS filesystem (${filesystem-squashfs}) and a list of files that should be included in the SquashFS filesystem.