bash html自动化脚本一次运行

i'm attempting to use bash scripts to create a web page, have no issue doing that at all. The problem is I need to get each part of the site to be added individually e.g the first file (main.html) needs to have navigation and content added which are separate scripts. My problem is trying to get them to run all at once using the command line.i'm attempting to use bash scripts to create a