unigears ltd - Shell-Bash

Unigears ltd is a software development company that specializes in building end-to-end solutions for businesses. One of the key skills that our team of developers possesses is in the area of Shell-Bash scripting.

What is Shell-Bash scripting?

Shell-Bash scripting is a way to automate tasks on a Unix-based operating system using the command-line interface. It involves writing code in the Bash programming language, which can then be executed by the command-line interpreter.

Why is Shell-Bash scripting important for programmers?

Shell-Bash scripting is a powerful tool that can save time and automate repetitive tasks. It is particularly useful for programmers who work with Unix-based systems, as it allows them to quickly and easily perform tasks such as file manipulation, data processing, and server maintenance.

Examples of Shell-Bash scripts

Here are a few examples of Shell-Bash scripts that our team has created for various clients:

1. A script that automatically backs up files on a server and sends the backup to a remote location for safekeeping.

#!/bin/bash

backup_dir="/var/backups"
remote_host="backup.remote.com"
remote_user="backupuser"
remote_dir="/remote/backups/"

tar -czf $backup_dir/$(date +%Y-%m-%d)_backup.tar.gz /data/to/backup/
scp $backup_dir/*_backup.tar.gz $remote_user@$remote_host:$remote_dir

2. A script that generates a report on server usage and sends it to a specified email address.

#!/bin/bash

report_file="/var/reports/server_usage_$(date +%Y-%m-%d).txt"
email_address="user@example.com"

echo "Server Usage Report for $(date +%Y-%m-%d)" > $report_file
echo "----------------------------------------" >> $report_file
echo "CPU usage: $(top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | awk '{print 100 - $1"%"}')" >> $report_file
echo "Memory usage: $(free -m | awk 'NR==2{printf "%s/%sMB (%.2f%%)", $3,$2,$3*100/$2 }')" >> $report_file
echo "Disk usage: $(df -h / | awk '{print $5}')" >> $report_file

mailx -s "Server Usage Report" $email_address < $report_file

3. A script that installs and configures a web server with nginx, PHP, and MySQL.

#!/bin/bash

apt-get update
apt-get install -y nginx php-fpm php-mysql mysql-server
systemctl enable nginx php7.0-fpm mysql

# Set up nginx configuration
cat > /etc/nginx/sites-available/default << EOL
server {
    listen 80 default_server;
    listen [::]:80 default_server;

    root /var/www/html;
    index index.php index.html index.htm;

    server_name _;

    location / {
        try_files $uri $uri/ =404;
    }

    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
    }
}
EOL

systemctl reload nginx

# Set up MySQL database and user
mysql -e "CREATE DATABASE dbname;"
mysql -e "CREATE USER 'dbuser'@'localhost' IDENTIFIED BY 'dbpassword';"
mysql -e "GRANT ALL PRIVILEGES ON dbname.* TO 'dbuser'@'localhost';"
mysql -e "FLUSH PRIVILEGES;"

These are just a few examples of the types of tasks that can be automated using Shell-Bash scripts. Our team has extensive experience in creating custom scripts to meet the specific needs of our clients.

Conclusion

In conclusion, Shell-Bash scripting is a valuable skill for programmers who work with Unix-based systems. It can save time, automate tasks, and increase efficiency. If you need help with Shell-Bash scripting or any other software development needs, feel free to contact us at Unigears ltd.