Quickly Remove Comments from Configuration Files
Configuration files can be long and complex and it is hard to see which values have been set. There are numerous ways to do this however, grep with -v (–invert-match) is a quick way to achieve this. The following example removes all the comments from an elasticsearch configuration file:
[email protected]:~$ sudo grep -v '#' /etc/elasticsearch/elasticsearch.yml
cluster.name: es node.name: es01 network.host: 10.1.10.187 discovery.zen.ping.unicast.hosts: ["10.1.10.187", "10.1.10.124"] discovery.zen.minimum_master_nodes: 2
Five lines where it is easy to see what has been configured. Rather than:
[email protected]:~$ sudo wc -l /etc/elasticsearch/elasticsearch.yml 94 /etc/elasticsearch/elasticsearch.yml
So we have removed 89 lines of comments and can review the configuration in five. Time saved!