#!/bin/bash
backup_dir="/path/to/backup"
source_dir="/path/to/source"

**Remote Server Backup**
```bash
#!/bin/bash
source_dir="/path/to/source"
remote_server="user@remoteserver:/path/to/backup"

**Backup Rotation Script**
```bash
#!/bin/bash
backup_dir="/path/to/backups"
max_backups=5

**Database Backup Script**
```bash
#!/bin/bash
database_name="your_database"
db_user="username"
db_pass="password"
output_file="database_backup_$(date +%Y%m%d).sql"

undefined

#!/bin/bash
threshold=90

**Disk Space Monitor**
```bash
#!/bin/bash
threshold=90
partition="/dev/sda1"

**CPU Usage Logger**
```bash
#!/bin/bash
output_file="cpu_usage_log.txt"

**System Health Check**
```bash
#!/bin/bash
output_file="system_health_check.txt"

undefined

#!/bin/bash
username="newuser"

# Set password interactively
passwd "$username"

**Password Expiry Checker**
```bash
#!/bin/bash
output_file="password_expiry_report.txt"

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#!/bin/bash
length=${1:-16}

**File Encryption Script**
```bash
#!/bin/bash
file="$1"
action="${2:-encrypt}"

if [ -z "$file" ]; then
    echo "Usage: $0 <file> [encrypt|decrypt]"
    exit 1
fi

if [ "$action" == "encrypt" ]; then
    # Encrypt file using AES-256-CBC
    openssl enc -aes-256-cbc -salt -pbkdf2 -in "$file" -out "$file.enc"
    echo "File encrypted: $file.enc"
elif [ "$action" == "decrypt" ]; then
    # Decrypt file
    output_file="${file%.enc}"
    openssl enc -aes-256-cbc -d -pbkdf2 -in "$file" -out "$output_file"
    echo "File decrypted: $output_file"
fi

#!/bin/bash
logfile="${1:-/var/log/syslog}"
output_file="error_log_$(date +%Y%m%d).txt"

**Web Server Log Analyzer**
```bash
#!/bin/bash
log_file="${1:-/var/log/apache2/access.log}"

echo "Web Server Log Analysis"
echo "========================"
echo ""
echo "Top 10 IP Addresses:"
awk '{print $1}' "$log_file" | sort | uniq -c | sort -rn | head -10
echo ""
echo "Top 10 Requested URLs:"
awk '{print $7}' "$log_file" | sort | uniq -c | sort -rn | head -10
echo ""
echo "HTTP Status Code Distribution:"
awk '{print $9}' "$log_file" | sort | uniq -c | sort -rn

#!/bin/bash
hosts=("8.8.8.8" "1.1.1.1" "google.com")

echo "Network Connectivity Check"
echo "=========================="

for host in "${hosts[@]}"; do
    if ping -c 1 -W 2 "$host" &>/dev/null; then
        echo "[UP] $host is reachable"
    else
        echo "[DOWN] $host is unreachable"
    fi
done

#!/bin/bash
websites=("https://google.com" "https://github.com")
log_file="uptime_log.txt"

echo "Website Uptime Check - $(date)" >> "$log_file"

for website in "${websites[@]}"; do
    if curl --output /dev/null --silent --head --fail --max-time 10 "$website"; then
        echo "[UP] $website is accessible" | tee -a "$log_file"
    else
        echo "[DOWN] $website is inaccessible" | tee -a "$log_file"
    fi
done

#!/bin/bash
interface="${1:-eth0}"

echo "Network Interface Information: $interface"
echo "========================================="
ip addr show "$interface" 2>/dev/null || ifconfig "$interface" 2>/dev/null
echo ""
echo "Routing Table:"
ip route | grep "$interface"

#!/bin/bash
packages=("vim" "htop" "curl" "wget" "git")

echo "Installing packages..."

for package in "${packages[@]}"; do
    if dpkg -l | grep -q "^ii  $package"; then
        echo "[SKIP] $package is already installed"
    else
        sudo apt-get install -y "$package"
        echo "[INSTALLED] $package"
    fi
done

echo "Package installation completed."

#!/bin/bash
scheduled_task="/path/to/your_script.sh"
schedule_time="0 2 * * *"  # Run at 2 AM daily

**Service Restart Script**
```bash
#!/bin/bash
service_name="${1:-apache2}"

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#!/bin/bash
source_dir="/path/to/source"
destination_dir="/path/to/destination"

**Data Cleanup Script**
```bash
#!/bin/bash
directory="${1:-/tmp}"
days="${2:-7}"

echo "Cleaning files older than $days days in $directory"

**Folder Size Checker**
```bash
#!/bin/bash
folder_path="${1:-.}"

echo "Folder Size Analysis: $folder_path"
echo "===================================="

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#!/bin/bash
output_file="system_info_$(hostname)_$(date +%Y%m%d).txt"

{
    echo "System Information Report"
    echo "Generated: $(date)"
    echo "========================="
    echo ""
    echo "Hostname: $(hostname)"
    echo "OS: $(uname -a)"
    echo ""
    echo "CPU Info:"
    lscpu | grep -E "Model name|CPU\(s\)|Thread"
    echo ""
    echo "Memory:"
    free -h
    echo ""
    echo "Disk Space:"
    df -h
    echo ""
    echo "Network Interfaces:"
    ip -br addr
    echo ""
    echo "Logged In Users:"
    who
} > "$output_file"

echo "System info saved to $output_file"

#!/bin/bash
git_repos=("/path/to/repo1" "/path/to/repo2")

for repo in "${git_repos[@]}"; do
    if [ -d "$repo/.git" ]; then
        echo "Updating repository: $repo"
        cd "$repo"
        git fetch --all
        git pull origin "$(git branch --show-current)"
        echo "Updated: $repo"
    else
        echo "Not a git repository: $repo"
    fi
done

echo "All repositories updated."

#!/bin/bash
remote_server="${1:-user@remote-server}"
remote_script="${2:-/path/to/remote/script.sh}"

undefined