We have a script which using a heredoc. We need to be able to write unexpanded variables in the heredoc. We want only the $domain_name would be expanded.
#!/bin/bash
domain_name='bonguides.me'
cat << EOF >> default.conf
server {
listen 80;
server_name $domain_name www.$domain_name;
location / {
try_files $uri $uri/ /index.php?$query_string;
}
}
EOFWhen we ran the script, as you can see we’re able to pass bonguides.me as vibrable into the file but $uri and $query_string are removed.
# ./installer.sh
# cat default.conf
server {
listen 80;
server_name bonguides.me www.bonguides.me;
location / {
try_files / /index.php?;
}
}We need only the variable $domain_name to be expanded and the $uri and $query_string still remain.
To dealing with that, you need add a before any variable that you don’t want to be expanded in a heredoc. So, the script should be look like below:
#!/bin/bash
domain_name='bonguides.me'
cat << EOF >> default.conf
server {
listen 80;
server_name $domain_name www.$domain_name;
location / {
try_files \$uri \$uri/ /index.php?\$query_string;
}
}
EOFWe’ve edited then run the script again, and now it works as expected.
# ./installer.sh
# cat default.conf
server {
listen 80;
server_name bonguides.me www.bonguides.me;
location / {
try_files $uri $uri/ /index.php?$query_string;
}
}ADVERTISEMENT
