Command Frequency Analyzer (CFA) - A simple Python script to display either the most frequently or least frequently used commands in Linux.

cfa.py

import os
from collections import Counter

def get_history_file():
    shell = os.path.basename(os.getenv('SHELL'))

    if shell == 'bash':
        return os.path.expanduser('~/.bash_history'), 'bash'
    elif shell == 'zsh':
        return os.path.expanduser('~/.zsh_history'), 'zsh'
    elif shell == 'fish':
        return os.path.expanduser('~/.local/share/fish/fish_history'), 'fish'
    else:
        return None, None

def parse_commands(history_file, shell_type):
    commands = []
    with open(history_file, 'r') as file:
        for line in file:
            if shell_type == 'bash' or shell_type == 'zsh':
                parts = line.strip().split()
                if parts:
                    commands.append(parts[0])
            elif shell_type == 'fish':
                if line.strip().startswith('- cmd:'):
                    commands.append(line.strip().split(': ')[1])
    return commands

def main():
    history_file, shell_type = get_history_file()

    if not history_file or not os.path.exists(history_file):
        print("History file not found for the current shell.")
        return

    commands = parse_commands(history_file, shell_type)
    command_count = Counter(commands)

    choice = input("Do you want to display the 'most' used or 'least' used commands? Enter most/least: ").lower()
    if choice not in ['most', 'least']:
        print("Invalid choice. Please enter 'most' or 'least'.")
        return

    try:
        num_commands = int(input("Enter the number of commands to display: "))
    except ValueError:
        print("Please enter a valid number.")
        return

    print(f"\nTop {num_commands} {choice} used commands:")
    if choice == 'most':
        for command, count in command_count.most_common(num_commands):
            print(f"{command}: {count}")
    elif choice == 'least':
        for command, count in command_count.most_common()[:-num_commands-1:-1]:
            print(f"{command}: {count}")

if __name__ == "__main__":
    main()

Display Most Frequently or Least Frequently Used Commands using CFA in Linux: