Category: Bash

#!/bin/bash
# Title: Detailed macOS User Last Login Checker with System Uptime
# Description:
# This script lists human user accounts (UID ≥ 500) on macOS and displays detailed information about their last login session.
# It also shows the current system uptime at the top.
#
# The output includes:
#   - System Uptime: How long the machine has been running since the last boot.
#   - Username     : The account name.
#   - Terminal     : The terminal device used during login.
#   - Login Date   : The date of the login (Day Month Date).
#   - Login Time   : The time when the login occurred.
#   - Login Status : Indicates if the session is still active or has ended.
#
# Note: "Never logged in" is shown if no login record exists.
#
# Retrieve and display system uptime
systemUptime=$(uptime)
echo "System Uptime: $systemUptime"
echo ""

# Print header for the login details
echo "Username | Terminal | Login Date       | Login Time | Login Status"
echo "---------------------------------------------------------------------"

# List users with their UniqueIDs and process each one.
dscl . -list /Users UniqueID | while read username uid; do
    if [ "$uid" -ge 500 ]; then
        # Retrieve the most recent login record for the user
        loginInfo=$(last -1 "$username" | head -n 1)
        
        # Check if there is a valid login record
        if echo "$loginInfo" | grep -q "wtmp begins"; then
            echo "$username |    -     |       -        |     -    | Never logged in"
        else
            # Parse the login record:
            #   Field 1: Username (redundant here)
            #   Field 2: Terminal (e.g., ttys000)
            #   Fields 3-5: Login Date (e.g., "Mon Feb 17")
            #   Field 6: Login Time (e.g., "05:44")
            #   Fields 7+: Login Status (e.g., "still logged in" or the session end time)
            terminal=$(echo "$loginInfo" | awk '{print $2}')
            login_date=$(echo "$loginInfo" | awk '{print $3, $4, $5}')
            login_time=$(echo "$loginInfo" | awk '{print $6}')
            login_status=$(echo "$loginInfo" | cut -d' ' -f7-)
            
            # Output the parsed details in a table-like format
            printf "%-8s | %-8s | %-16s | %-10s | %s\n" "$username" "$terminal" "$login_date" "$login_time" "$login_status"
        fi
    fi
done

# Legend:
#   System Uptime - How long the system has been running since the last boot.
#   Username      - The account name.
#   Terminal      - The terminal device used during login.
#   Login Date    - The date of the login (Day Month Date).
#   Login Time    - The time of the login.
#   Login Status  - The current status of the login session.

#!/bin/bash
# This script lists user accounts (UID >= 500) and shows additional details:
# Username, UID, Admin Privileges (true/false), Full Name, Home Directory, and Shell

# Print header for clarity
echo "Username : UID : Has Admin Privileges : Full Name : Home Directory : Shell"

# List all users with their UniqueID and process each line
dscl . -list /Users UniqueID | while read username uid; do
    # Only process accounts with UID >= 500 (typically non-system, human user accounts)
    if [ "$uid" -ge 500 ]; then
        # Check if the user belongs to the 'admin' group
        if id -Gn "$username" 2>/dev/null | grep -qw "admin"; then
            adminFlag="true"
        else
            adminFlag="false"
        fi

        # Get the user's full name (if set). The command outputs a line like "RealName: John Doe"
        fullName=$(dscl . -read /Users/"$username" RealName 2>/dev/null | sed 's/RealName: //')
        
        # Get the user's home directory
        homeDir=$(dscl . -read /Users/"$username" NFSHomeDirectory 2>/dev/null | sed 's/NFSHomeDirectory: //')
        
        # Get the user's default shell
        shell=$(dscl . -read /Users/"$username" UserShell 2>/dev/null | sed 's/UserShell: //')
        
        # Output the collected information in a clear, colon-separated format
        echo "$username : $uid : $adminFlag : $fullName : $homeDir : $shell"
    fi
done

#!/bin/bash
# system_specs.sh - Display Mac system specs and performance info

# Clear the terminal for a fresh display
clear

echo "======================================"
echo "   Mac System Specs and Performance   "
echo "======================================"

# Operating System Information
os_name=$(sw_vers -productName)
os_version=$(sw_vers -productVersion)
build_version=$(sw_vers -buildVersion)
echo "Operating System: $os_name $os_version (Build $build_version)"

# Computer Name (if set)
computer_name=$(scutil --get ComputerName 2>/dev/null)
if [ -n "$computer_name" ]; then
    echo "Computer Name: $computer_name"
fi

echo "--------------------------------------"

# CPU Information
cpu_brand=$(sysctl -n machdep.cpu.brand_string)
physical_cpu=$(sysctl -n hw.physicalcpu)
logical_cpu=$(sysctl -n hw.logicalcpu)
echo "CPU: $cpu_brand"
echo "Physical Cores: $physical_cpu"
echo "Logical Cores: $logical_cpu"

echo "--------------------------------------"

# Memory (RAM) Information
mem_bytes=$(sysctl -n hw.memsize)
# Convert bytes to gigabytes (1GB = 1073741824 bytes)
mem_gb=$(echo "scale=2; $mem_bytes/1073741824" | bc)
echo "Memory (RAM): $mem_gb GB"

echo "--------------------------------------"

# Disk Usage for the Root Partition
echo "Disk Usage (Root Partition):"
# Display header and the line for '/' partition
df -h / | awk 'NR==1 || $NF=="/"'
echo "--------------------------------------"

# Uptime and Load Average
echo "Uptime and Load Average:"
uptime
echo "--------------------------------------"

# Battery Information (if available)
if command -v pmset &> /dev/null; then
    battery_info=$(pmset -g batt | head -1)
    echo "Battery Info: $battery_info"
fi

echo "======================================"