How to avoid repeating sed commands when adding sites to Varnish?

This is my script to install Varnish. I run it each time I raise up a new server environment on a VPS. cd ~ apt-get update apt-get install varnish -y sed -i 's/Listen 80/Listen 8080/g' /etc/apache2/ports.conf sed -i 's/\*\:80/\*\:8080/g' /etc/apache2/sites-available/000-default.conf sed -i 's/\*\:80/\*\:8080/g' /etc/apache2/sites-available/domain1.tld.conf && a2ensite domain1.tld.conf sed -i 's/\*\:80/\*\:8080/g' /etc/apache2/sites-available/domain2.tld.conf && a2ensite domain2.tld.conf sed -i 's/\*\:80/\*\:8080/g' /etc/apache2/sites-available/domain3.tld.conf && a2ensite domain3.tld.conf sed -i 's/\*\:80/\*\:8080/g' /etc/apache2/sites-available/domain4.tld.conf && a2ensite domain4.tld.conf mkdir -p /etc/systemd/system/varnish.service.d # Be aware! You might not need this in the future. cat /etc/systemd/system/varnish.service.d/customexec.conf [Service] ExecStart= ExecStart=/usr/sbin/varnishd -j unix,user=vcache -F -a :80 -T localhost:6082 -f /etc/varnish/default.vcl -S /etc/varnish/secret -s malloc,256m VARNISH systemctl restart apache2.service && systemctl daemon-reload && systemctl restart varnish.service This code segment seems quite "heavy", especially the repetitiveness of the sed operations regarding domain.tld. This get's even "heavier" because I have a code segment which is similar in length that uses to me uninstall varnish and revert all changes just in case of desire. ## My question: What strategy will you take to make the installation script shorter in general (at least less rows, maybe also less commands), and in particular, to lower amount of sed operations. ## Notes: * I would assume that the first thing to do is to somehow unify ports.conf, 000-default.conf, and each .conf file of each site, all into one operation. Maybe via a for loop on /etc/apache2/ports.conf/ && /etc/apache2/sites-available/*/.