pdfjam:tldr:d6e46

This command is using the pdfjam tool to manipulate a PDF file.

Here is a breakdown of the different parts of the command:

1. ${filename-pdf}: This is a placeholder for the name of the PDF file you want to process. You need to replace ${filename-pdf} with the actual name of the file (including the file extension .pdf).

2. --nup ${2x2}: This option arranges multiple pages of the PDF file into a grid. ${2x2} is a placeholder for the desired layout. In this case, it specifies a 2x2 grid, meaning that four pages will be arranged in a 2x2 format on a single page.

3. --suffix ${4up}: This option adds a suffix to the output file name to indicate the new layout. ${4up} is a placeholder for the desired suffix. In this case, it indicates that the output file should be named with a 4up suffix to signify the 4-up layout.

4. --preamble '${\usepackage{fancyhdr} \pagestyle{fancy}}': This option allows you to include custom LaTeX code in the document preamble. The given code is enclosed in single quotes (') to ensure it is interpreted correctly. In this case, it includes the fancyhdr package and sets the page style to fancy. This allows you to further customize the headers and footers of the generated PDF file with the help of fancyhdr package.

Overall, this command takes a PDF file, arranges its pages in a 2x2 grid format, adds a 4up suffix to the output file name, and includes custom LaTeX code in the preamble to modify the page style of the resulting PDF.