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将变量传递给 cat

tag-icon • tag-icon variable cat here-document
将变量传递给 cat

我在 bash 脚本中只有一个变量${PHP_V}，并尝试传入 nginx 配置文件，例如：

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

但没有成功。怎么做？

答案1

您需要取消引号EOF：

如果引用了word的任何部分，则应通过对word进行去除引号来形成分隔符，并且此处文档行不会被扩展。否则，分隔符应为单词本身。

如果没有引用单词的任何部分，则应扩展此处文档的所有行以进行参数扩展、命令替换和算术扩展。

看 ：2.7.4 Here-文档

但请注意，您的此处文档中有几处内容需要单独转义以防止扩展：

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

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