Hector Perez

Linux permissions r w x Binary Decimal rwx Meaning 1 1 1 111 7 rwx Read, Write, Execute 1 1 0 110 6 rw- Read, Write 1 0 1 101 5 r-x Read, Execute 1 0 0 100 4 r-- Read 0 1 1 011 3 -wx Write, Execute 0

Install docker apt install docker.io Uninstall docker apt-get remove docker docker-engine docker.io Export container to TAR file docker export containerNameOrID > /home/user/my_file_name_$(date +%d-%m-%Y_%H-%M-%S).tar Import container from TAR file docker import /home/user/my_file_name.tar docker import

Create Database use blog db.createCollection("posts") Connection string for replica set mongodb://db1.server.com:port,db2.server.com:port,arbiter.server.com:port/MyDataBaseName?replicaSet=MyReplicaSetName Connection string for an authenficated replica set mongodb://myusername:mypassw0rd@db1.server.com:port,db2.server.com:port,arbiter.server.com:port/

Encode String to Base64 console.log(Buffer.from('This message will be encoded to base64', 'utf8').toString('base64')); Decode String from Base64 console.log(Buffer.from('VGhpcyBtZXNzYWdlIHdpbGwgYmUgZW5jb2RlZCB0byBiYXNlNjQ=', 'base64').toString('utf8')); Generate random UUID from console (oneliner) console.log(require('crypto').randomUUID()); Replace all ocurrences of a string (Method 1)