Create Apache redirects sites file from file list of subdomains

create-vhost-redirects-site.conf.sh

#!/bin/bash

inputfile=./subdomains-list.txt
outputfile=./my-apache.conf
host_names=""

# start fresh
if [ -a "$outputfile" ]
then
  rm $outputfile
fi

#start site.conf by creating a 'header' - not really needed:
cat <<EOF >> $outputfile
# Brady Shea 27mar2019

# Global to this file
# Possible values include: debug, info, notice, warn, error, crit, alert, emerg
LogLevel warn
ErrorLog \${APACHE_LOG_DIR}/error-redirects.log
CustomLog \${APACHE_LOG_DIR}/access-redirects.log combined
EOF

# read subdomains/hosts from text file defined and add entries to the apache conf file..
# grep -vE '^(\s*$|#)' $inputfile
#  = pipe without '#' comments and blank lines.
grep -vE '^(\s*$|#)' $inputfile | while read -r host_name
do
case "$host_name" in \#*) continue ;; esac # skip comments and blanks

if [ -w "$outputfile" ]
then
  cat <<EOF >> $outputfile

<VirtualHost *:80>
        ServerName *.$host_name.example.com
        ErrorLog  \${APACHE_LOG_DIR}/redirect.example.com-error.log
        CustomLog \${APACHE_LOG_DIR}/redirect.example.com-access.log common
        Redirect 301 / https://$host_name.example.com/
</VirtualHost>
<VirtualHost *:443>
        ServerName *.$host_name.example.com
        ErrorLog  \${APACHE_LOG_DIR}/redirect.example.com-ssl-error.log
        CustomLog \${APACHE_LOG_DIR}/redirect.example.com-ssl-access.log common
        SSLEngine On
        SSLCompression off
        SSLProtocol             all -SSLv2 -SSLv3
        SSLCertificateKeyFile   /etc/letsencrypt/live/wildcard.subdomains.example.com/privkey.pem
        SSLCertificateFile      /etc/letsencrypt/live/wildcard.subdomains.example.com/cert.pem
        SSLCertificateChainFile /etc/letsencrypt/live/wildcard.subdomains.example.com/chain.pem
        Redirect 301 / https://$host_name.example.com/
</VirtualHost>

EOF
fi

done

subdomains-list.txt

#
# These comments are skipped.
#
subdomainexmaple1
#
# comments
#
subdomainexmaple1
subdomainexmaple2
subdomainexmaple3
# comment
examplesubdomain1
examplesubdomain2
examplesubdomain3
examplesubdomain4
examplesubdomain5
examplesubdomain6
examplesubdomain7
examplesubdomain8
examplesubdomain9
examplesubdomain10
examplesubdomain11
examplesubdomain12
examplesubdomain13
# blank lines are also skipped

# more comments
examplesubdomain100
examplesubdomain101