weshouman

# I usually add a similar block to the .bashrc

####################################
#####  My Stuff: Walid Shouman  ####
####################################

# disable freezing, follow https://unix.stackexchange.com/a/72092/310075
stty -ixon

#~~~~~~~~~~~~~~~~~~~~~~~#

weshouman

1. Simple Assignment (=):

   • It assigns a value to a variable.

   • The value of the variable is evaluated when the variable is used, not when it's declared.

   • This means that if you reference other variables in the assignment, their values will be expanded at the time of use, not at the time of assignment.

     FOO = $(BAR)
     BAR = Hello
     all:

@echo $(FOO) # This will output "Hello"

weshouman

Execute but Keep the Current Working Directory

following code changes cwd to ./step1

cd step_1
./build.sh
./test.sh

adding braces gets the code executed w/o affecting the cwd

(cd step_1 && ./build.sh && ./test.sh)

weshouman

import unittest
import tempfile
import subprocess

# One could use vimdiff, meld, or even diff
def diff_with(test_func=None, tool='vimdiff'):
    # The decorator was used with parentheses
    # thus the test_func is not set, we need to call it ourself
    if test_func is None:  
        return functools.partial(diff_with, tool=tool)

weshouman

#!/usr/bin/python

# This script cleans up reference keys assuming they start with an underscore
import yaml
import argparse

def read_data(input_file):
    # Read YAML file
    with open(input_file, 'r') as f:
        data = yaml.safe_load(f)

weshouman

PATH = /tmp/

define myfn
  processed_input=${PATH}/$(2)
  $(1) := $$(processed_input)
endef

mytarget:
	$(eval FILE=myfile)
	$(eval $(call myfn,abs_filename,$(FILE)))

weshouman

apt configurations are located in /etc/apt/ following is a breakdown for the different directories

Main Components

1. sources.list: This is the main list of repositories that APT will use for software package management. Each line in this file specifies a different repository. Ref: man 5 sources.list

2. sources.list.d/: This directory allows you to add additional repository lists without modifying the main sources.list file. Each file in this directory should end with .list and contain one or more repository lines, just like the main sources.list file. Ref: man 5 sources.list

weshouman

The eBPF (Extended Berkeley Packet Filter) language is a low-level assembly-like language that is specifically designed for writing programs that can be loaded into the Linux kernel. These programs are typically used for networking, security, and observability tasks.

eBPF has its own domain-specific language (DSL), following are some information about it.

Characteristics of eBPF DSL:

1. Low-Level: The language is closer to assembly than to high-level languages like C.

2. Limited Instructions: eBPF has a limited set of instructions to ensure that programs are safe to run in the kernel space.

weshouman

Following is an index for the official Cilium documentation

---

Cilium Documentation Navigation Sheet

---

Overview

• Introduction to Cilium & Hubble - An introductory guide to Cilium and Hubble.

weshouman

• pip install pybind11: install requirements
• pip3 show pybind11 | grep Location: to ensure installation
• .\install_evdi.sh: install evdi