title: Modification of configuration file using sed
body: <p>mongod.conf file</p>
  
  <pre><code> # mongod.conf
   # for documentation of all options, see:
   # http://docs.mongodb.org/manual/reference/configuration-options/
   # Where and how to store data.
     storage:
     dbPath: /var/lib/mongodb
     journal:
     enabled: true
   #  engine:
   #  mmapv1:
   #  wiredTiger:
   # where to write logging data.
     systemLog:
     destination: file
     logAppend: true
     path: /var/log/mongodb/mongod.log
   # network interfaces
     net:
     port: 27017
     bindIp: 127.0.0.1
   #processManagement:
   #security:
   #operationProfiling:
   #replication:
   #sharding:
   ## Enterprise-Only Options  
   #auditLog: 
   #snmp:
  </code></pre>
  
  <p>This is the mongoDB configuration file I have, I need to Update keys in the file like this,</p>
  
  <pre><code>port: 27017 
  bindIp: 0.0.0.0 
  #security: 
  keyFile:/opt/mongodb/keyfile 
  authorization: enabled 
  #replication: 
  replSetName: mongoreplica1
  </code></pre>
  
  <p>How can I do this using bash script?</p>