normoes

binary math

source

2's complement

101 -> 010 + 1 = 011
11010 -> 00101 + 1 = 00110

binary subtraction

normoes

hidden files

create an archive using tar (including hidden files)

taken from Digitesters

Normally:

tar czf backup.tar.gz /backup/*

This way all files are tarred except the hidden files.

normoes

password creation

cli password generation

apg -a 1 -m 15 -n 15

Output

HrTvb(r&xb1~}Xr
`i;af,/z%bi8(`x

normoes

mongodb aggregates using MongoRepository in Java spring boot

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Some prerequisites and assumptions

Use the following dependencies within your pom.xml:

• spring-boot-starter-parent 1.5.7.RELEASE
• spring-boot-starter-data-mongodb