gvpack:tldr:936e3

The command gvpack -u ${path-to-layout1-gv} ${path-to-layout2-gv} > ${path-to-output-gv} is used to merge and compress two Graphviz DOT files (Graph Visualization Language files) into a single DOT file.

Here's a breakdown of each part of the command:

• gvpack: This is the command-line tool used to merge and compress Graphviz DOT files.
• -u: This option tells gvpack to perform a union merge of the input files. The nodes and edges from both input layouts will be included in the output.
• ${path-to-layout1-gv}: This is the placeholder for the path to the first input layout file. You need to replace ${path-to-layout1-gv} with the actual file path, including its name and extension, e.g., ~/layouts/layout1.gv. This file contains the first layout you want to merge.
• ${path-to-layout2-gv}: This is the placeholder for the path to the second input layout file. Just like the first file, replace ${path-to-layout2-gv} with the actual path and filename, e.g., ~/layouts/layout2.gv. This file contains the second layout you want to merge.
• >: This symbol is used for output redirection. It saves the output of the command into a file rather than displaying it in the terminal.
• ${path-to-output-gv}: This is the placeholder for the path where you want to save the output file after merging the layouts. Replace ${path-to-output-gv} with the desired path, filename, and extension, e.g., ~/output/result.gv. The merged layout will be saved in this file.

To use the command, you need to replace ${path-to-layout1-gv}, ${path-to-layout2-gv}, and ${path-to-output-gv} with the actual file paths you're working with.