How can I output the projects.txt contents to another file named newProjects.txt starting from line 4 for example.
projects.txt
newProjects.txt
You could do something like tail -n +5 projects.txt >> newProjects.txt. The -n +5 will "skip" the first 4 lines of projects.txt.
tail -n +5 projects.txt >> newProjects.txt
-n +5