Bash Scripting Applications Explained

Prerequisites:

• Read this blog, which covers basic to advanced bash scripting, and for understanding, please go through the blog linked below:

https://medium.surajshetty.blog/quick-bash-scripting-mastery-for-server-admins-1a8dbd4c7580

Let’s start with the real-life application of bash scripting:

1. Backing up files:

Taking a backup of your files is the most important thing you can do every day.

src_dir=/home/ubuntu/scriptfolder
trgt_dir=/home/ubuntu/backups

curr_timestamp=$(date "+%Y-%m-%d-%H-%M-%S")
backup_file=$trgt_dir/$curr_timestamp.tgz

echo "taking backup on $curr_timestamp"
echo "$backup_file"

tar czf $backup_file --absolute-names $src_dir

echo "Backup complete"

2. Add Firewall and Rules:

Adding a firewall and rules is crucial for all servers, and scripting makes it an easy job.

#isntall the firewall
sudo yum install firewalld
sudo systemctl start firewalld
sudo systemctl enable firewalld
sudo firewall-cmd --state

#Setting Firewall Rules
sudo firewall-cmd --permanent --add-port=PORT/tcp
sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="IP_ADDRESS" port protocol="tcp" port="PORT" accept'
sudo firewall-cmd…