Pass variable to cat

Question

I have only one variable in bash script ${PHP_V} and trying to pass in nginx config file like:

cat <<'EOF' > /etc/nginx/sites-available/default
server {
    listen 80 default_server; 
    listen [::]:80 default_server; 

    listen 443 ssl default_server; 
    listen [::]:443 ssl default_server; 

    root /vagrant/webroot; 

    index index.php; 

    server_name _; 

    ssl_certificate /etc/nginx/certs/vagrantbox.crt; 
    ssl_certificate_key /etc/nginx/certs/vagrantbox.key;  

    location / { 
        try_files $uri $uri/ /index.php?$args; 
    } 

    location ~ \.php$ { 
        try_files $uri =404; 
        include fastcgi_params; 
        fastcgi_pass unix:/run/php/php${PHP_V}-fpm.sock; 
        fastcgi_index index.php; 
        fastcgi_intercept_errors on; 
        fastcgi_param SCRIPT_FILENAME 
        $document_root$fastcgi_script_name; 
    }
}
EOF

but without success. How to do?

See passing and setting variables in a heredoc – steeldriver May 31 '19 at 16:17 — steeldriver, May 31 '19 at 16:17

score 7 · Accepted Answer · edited Jun 11 '20 at 14:16

You need to unquote EOF:

If any part of word is quoted, the delimiter shall be formed by performing quote removal on word, and the here-document lines shall not be expanded. Otherwise, the delimiter shall be the word itself.

If no part of word is quoted, all lines of the here-document shall be expanded for parameter expansion, command substitution, and arithmetic expansion.

See : 2.7.4 Here-Document

Note however that there are several things in your here document that will need to be individually escaped to prevent expansion:

cat <<EOF > /etc/nginx/sites-available/default
server {
    listen 80 default_server; 
    listen [::]:80 default_server;
listen 443 ssl default_server; 
listen [::]:443 ssl default_server; 

root /vagrant/webroot; 

index index.php; 

server_name _; 

ssl_certificate /etc/nginx/certs/vagrantbox.crt; 
ssl_certificate_key /etc/nginx/certs/vagrantbox.key;  

location / { 
    try_files \$uri \$uri/ /index.php?\$args; 
} 

location ~ \.php\$ { 
    try_files \$uri =404; 
    include fastcgi_params; 
    fastcgi_pass unix:/run/php/php${PHP_V}-fpm.sock; 
    fastcgi_index index.php; 
    fastcgi_intercept_errors on; 
    fastcgi_param SCRIPT_FILENAME 
    \$document_root\$fastcgi_script_name; 
}

}
EOF

Pass variable to cat

1 Answers1