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docker ps # get info on all containers
docker stats <containerid>  #get cpu memory info for a container
docker exec -it <containerid> /bin/bash #get into container shell
docker cp <containerid>:/containerpath/1000000.txt /hostpath #copies a file from active container.
scp -i <security pem file path> <remotemachine>:/home/ec2-user/1000000.txt <localmachinepath>
ssh -i /path/my-key-pair.pem my-instance-user-name@my-instance-public-dns-name

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---To find database size, works with PG 12---------------------
SELECT pg_size_pretty( pg_database_size('QA') );
--------------------------------------------------------------------

-------------  To find out top X size of tables, works with PG12 ----------------------

SELECT
   nspname, relname AS "relation",
    pg_size_pretty (
        pg_total_relation_size (C .oid)

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24 * * * * PGPASSWORD=postgres psql -h localhost -U postgres -d Test -f /home/ubuntu/inserts.sql >> /home/ubuntu/1.txt

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let i=parseInt(0700,10)//GOOD Implementation radix is passed.
let i=parseInt(0700)//BAD Implementation choosing the radix is now upto the runtime.
//Check this article: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt
//If the input string begins with "0", radix is eight (octal) or 10 (decimal).  Exactly which radix is chosen is implementation-dependent.  ECMAScript 5 specifies that 10 (decimal) is used, but not all browsers support this yet.  For this reason always specify a radix when using parseInt.

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if (!process.env.NODE_ENV) {
  process.env.NODE_ENV = 'production'
}

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var createError = require('http-errors');
var express = require('express');
var app = express();

app.use(function (req, res, next) {
  next(createError(404));
});

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var app = express();

//All routes to hook it up to
app.use('/', rootModule); 
app.use('/module1', module1);
app.use('/module2', module2);

//Handle other requests that doesnot fall through above routes
app.use(function (req, res, next) {
  next(createError(404));

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curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.32.0/install.sh | bash  ##Replace the verion with latest
nvm ls-remote ## select version 
nvm install xx.xx.x #install the specified version