Trap_Killa

Can't be without Music
Rapper/Singer/Graffiti
@Dj_MuzHolic
@ThaNutHead @DopedHaze $traightOuttaSamburuKe™

[Engineer Things @EngineerThing]

Types of Roofs 🏠

[AI Updates X @AIUpdatesX]

Android secret codes

[Nandkishor @devops_nk]

🔐 Linux File Permissions: explained like a human

In Linux, permissions use 3-digit octal numbers like 755 or 644.

Each digit represents permissions for:
👤 Owner (User)
👥 Group
🌍 Others

Permission values:
- Read (r) = 4
- Write (w) = 2
- Execute (x) = 1

How to remember keep 4 as constant and then add:
7 = rwx (4+2+1)
6 = rw- (4+2)
5 = r-x (4+1)

Examples:
755 → rwx r-x r-x
644 → rw- r-- r--

Once you get this, chmod stops feeling like magic.

[tetsuo @tetsuoai]

Linux Device Drivers is still one of the best reads if you want to understand how the kernel talks to hardware.

You'll want some C and basic Unix syscall knowledge, but the examples make it easy to just go through and start learning.

[𝐇𝐚𝐦𝐳𝐚 | Networking Guy @Hamzaonchain]

THE NETWORKING ACRONYM CHEAT SHEET FROM MY PREVIOUS POST 👇

• EMAIL PROTOCOLS

SMTP → Simple Mail Transfer Protocol

SMTPS → SMTP over TLS (Secure)

POP3 → Post Office Protocol v3

POPS → POP3 over TLS (Secure)

IMAP → Internet Message Access Protocol

IMAPS → IMAP over TLS (Secure)

• WEB & DIRECTORY

HTTP/1.1 & HTTP/2 → HyperText Transfer Protocol versions

HTTP3 → HyperText Transfer Protocol version 3

HTTPS → HyperText Transfer Protocol Secure

DNS → Domain Name System

LDAP → Lightweight Directory Access Protocol

LDAPS → LDAP Secure

• SECURITY & REMOTE ACCESS

SSL/TLS → Secure Sockets Layer / Transport Layer Security

TLS → Transport Layer Security

SSH → Secure Shell

IPsec → Internet Protocol Security

RDP → Remote Desktop Protocol

VNC → Virtual Network Computing

• TRANSPORT LAYER

TCP → Transmission Control Protocol

UDP → User Datagram Protocol

QUIC → Quick UDP Internet Connections

SCTP → Stream Control Transmission Protocol

DCCP → Datagram Congestion Control Protocol

RTP → Real-time Transport Protocol

• NETWORK LAYER & ROUTING

IPv4 / IPv6 → Internet Protocol version 4 / version 6

ICMP / ICMPv6 → Internet Control Message Protocol (v4/v6)

BGP → Border Gateway Protocol

OSPF → Open Shortest Path First

RIP → Routing Information Protocol

• MANAGEMENT & CONFIG

DHCP / DHCPv6 → Dynamic Host Configuration Protocol (v4/v6)

SNMP → Simple Network Management Protocol

NTP → Network Time Protocol

SIP → Session Initiation Protocol