This repository includes four Bash scripts designed for Linux system automation and monitoring tasks. Each script is interactive and user-friendly.

Creates a compressed backup of a specified directory.

• Prompts the user for the full path of the directory to back up.
• Validates that the directory exists and is readable.
• Creates a gzip-compressed .tar.gz file in ~/backups/, named like:
  backup_<dir_name>_YYYYMMDD_HHMMSS.tar.gz
• Retains only the last 7 backups; older ones are automatically deleted.
• Notifies the user about success or any errors.

Monitors log files for important entries.

• Prompts the user for the full path of a system log file (e.g. /var/log/syslog).
• Searches for entries containing keywords: error, warning, critical (case-insensitive).
• Saves matching lines into a report file:
  ~/important_<log_name>_<date>.log
• If no matches are found, the report is not created.
• Automatically deletes report files older than 7 days.
• Displays the number of matches and a preview (first 5 lines).

Displays system and hardware information in a formatted output.

• Shows current date/time, hostname, user.
• Displays CPU/RAM usage and disk space.
• Lists:
  • OS name, kernel version, uptime
  • Number of installed packages
  • Desktop environment and window manager (if available)
  • Top 5 processes by CPU and RAM usage
• Uses color-coded output for clarity.

Organizes files in a specified directory based on file extension.

• Accepts a directory as input.
• Validates the directory’s existence.
• Creates subfolders for each unique file extension.
• Moves files into corresponding subfolders (e.g. .txt → txt/).
• Files without extensions go into a no_extension/ folder.
• Displays informative messages during the organization process.

Each script is executable. Make sure to give execute permissions:

chmod +x script_name.sh

Then run:

./script_name.sh

For organize_by_extension.sh, provide the directory as an argument:

./organize_by_extension.sh /path/to/your/folder

• Bash shell (typically preinstalled on most Linux distros)
• Standard GNU utilities (tar, find, grep, df, ps, etc.)

Course: Operating Systems - Unix

Institution: University of Piraeus