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Basic Usage example of Linux Firewalld UFW
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awk usage examples
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Linux Network Monitoring with Iptraf/Iptraf-ng
Linux kernel development reference
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mosh - UDP based SSH client
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netstat command usage in Linux
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What is SetUID SetGID & Sticky bit and How to Use Them
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How to compress gz/bz2/xz files with tar command in Linux
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How to solve: Too many TCP connections
How to trigger a Kernel panic & get coredump
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CentOS
CentOS
How to get Wildcard Certificate with acme.sh
How to Add user to admin group on CentOS
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Compile nginx to support http/2
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Install different version of gcc
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Extanded repo on CentOS
Send email using sendmail
Change Timezone on CentOS
Find which package provide command
Install BT Transmission on CentOS
iostat command cannot found
mkfs.xfs command not found on CentOS
Debian Ubuntu
Debian Ubuntu
Add Swap on Ubuntu 24.04
Compile & Install Ocserv on Debian
Install OpenVPN on Debian 11
Optimise BBR on Debian
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Extract files from deb package
Remove login welcome message
Systemd User Service Example
Disable ipv6 on Ubuntu & Debian
Disable snapd on Ubuntu 20.04
Install LAMP on Ubuntu 22.04
Install sar error Please check if data collecting is enabled
Upgrade debian 10 to 11
FreeBSD
FreeBSD
FreeBSD cheat sheet
Alternative Linux commands on FreeBSD
Build FreeBSD kernel
Change csh to bash on FreeBSD
Disable ping on FreeBSD
FreeBSD git repo
Install ocserv on FreeBSD
FreeBSD update
Upgrade FreeBSD 12 To 13
MacOS
MacOS
Delete .DS_Store files on MacOS
Disable brew analytics on MacOS
Signing on MacOS
netstat ss on MacOS
Clean system log on MacOS
MacOS Dev Env Setup
Get a plain text of man page without backspaces and underscores on MacOS/BSD
LC_CTYPE: cannot change locale (UTF-8): No such file or directory
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Linux Log Summary
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Promtail Log Collector
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What is APM
Dynatrace
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Performance
Performance
Performance Tuning
How to get CPU model
InnoDB Optimization Tips
Kernel tunning for PostgreSQL
Ceph Performance Tuning
Performance checklist for Linux
Linux I/O Scheduler for SSD
dirty page related kernel parameters
How to enable high resolution timers in Linux
Linux网络参数优化
Kernel parameter optimization for Linux
Linux kernel parameter in proc filesystem
Performance monitoring & tracing tools in Linux
USE Method & Performance Tuning in Linux
Benchmark with sysbench command
Load Testing with Siege
Fetch System Info in Terminal
Optimize Nginx for High Concurrency
Python
Python
Python3 Cheatsheet
19 Python Syntax Sugars
Django Command Line Reference
Implement lru in Python
Get public IP in Python
Send http requests in Python
Boost Python Function with Numba
Python bisect module
Catch signal in Python
Clear screen in Python
Packages & modules in Python
Python Asynchronous
Python datetime module
Currency Calculation in Python
Python Decorators
3 ways to set timeout in Python
8 ways to use functools
Get local IP address in Python
GIL in Python
Iterate over multiple lists & tuple
List, Dictionary, Set in Python
3 ways to disable output buffer
Fast pairing lists in Python
Python Performance Analysis
Python Project Structure
Virtualenv
Program in Pythonic way
Single & Double underscore of class member
Sort dict based on key, value
try except else finally in Python
CPython vs PyPy
Start Python3 in 10 seconds
Multiple CORS in Flask
Where is Python packages
SRE
SRE
Site Reliability Engineering
Architecture
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DR: Disaster Recovery
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Shell
Shell
Shell Commands Cheatsheet
Convert JSON to CSV
Bash Cheatsheet
Disable Output Redirect
Bash Reference
Special characters in Bash
Concurrency Control in Bash
Delete files with space characters in file name
Fish Shell
Get union, intersection, difference of 2 files
Bash Scripting
Add dir to PATH
Extract multi segments of a json file and merge into 1 line with jq
One-liner bash script reference
Arithmetic in Bash
Array in Bash
Get file name from path
Concurrency in Bash
Debug in Bash
Detach foreground process
Usage of $ sign in Bash
Detect file exists
Bash Function
Detect current user is root
Remove color codes from output
Variable Replacement/Truncate
User switch in Linux
Test Statement
Types of Variables
Different loop style in Bash
Get current shell name
Disable output redirection
Better grep command
Repeat lastest command in Bash
Create a file with EOF in Bash
Reverse Shell
Environment variable in csh tcsh bash zsh
change stdout with ANSI character set
Extract password protected zip file
Clear history in zsh
Tips
Tips
Tips for SRE
Docked Rails CLI
HTTPS/SSL
Setup SSL for MySQL on Linux
Nginx Proxy Manager
Latency & CPU Speed
Linux Manual Page
SQL Cheatsheet
MySQL Utilities
Perl Cheatsheet
PostgreSQL Cheatsheet
RAID Calculator
SQL Q&A
WebSockets
Backup Mysql via SSH tunnel
Build Ruby on MacOS
Command line browser
Compact jq output in 1 line
curl: Argument list too long
Ignore SSL check in curl & wget
Download web with wget
Free IP SSL cert
Groovy Cheat Sheet
Cron Usage
ack usage example
ag usage example
alias usage example
bat usage example
bottom usage example
broot usage example
cat usage example
cheat usage example
chmod usage example
choose usage example
chroot usage example
curlie usage example
date usage example
e2fsck usage example
echo usage example
ffmpeg usage example
find usage example
fsck usage example
glances usage example
gping usage example
gtop usage example
head usage example
httpie usage example
hurl usage example
hyperfine usage example
journalctl usage example
jq usage example
kill usage example
less usage example
logrotate usage example
lsmod, modinfo usage
mount usage example
mysqldump usage example
nslookup usage example
procs usage example
ps usage example
rclone usage example
ripgrep usage example
rm usage example
rsync usage example
scp usage example
screen usage example
sd usage example
sed usage example
sort & uniq example
ssh tunnel example
systemctl usage example
tail usage example
tar usage example
tar & gzip example
tcpdump usage example
tldr usage example
xargs usage example
HTTP Debug Tools
HTTPS Benchmark
Search Icon Online
iperf3 usage example
HTTP Time Distribution
Nginx status module
ping usage example
Realtime HTTP benchmark
WAF with LuaJIT
Lua Cheatsheet
Nginx as reverse proxy for WebSocket
Nmap usage
OpenResty
PHP Tips & Notes
Port scan with rustscan
QUIC
Regular Expressions
Reset MySQL Root Password
RSS List
Ruby Cheatsheet
Clear terminal screen in Rust
Rust Tips & Notes
Remove SSL private key password
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Save file with permission denied in vim
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