How to write basic bash scripts

STEP 3: WRITE BASIC BASH SCRIPTS

Portions of the Gramm-Leach-Bliley Act require organizations to maintain a regular backup regimen for the safe and secure storage of financial data.

You’ll first need to set up multiple backup directories. Each directory will be dedicated to housing text files that you will create with different kinds of system information.

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For example, the directory freemem will be used to store free memory system information files.

  1. Using brace expansion, create the following four directories:
    • ~/backups/freemem
    • ~/backups/diskuse
    • ~/backups/openlist
    • ~/backups/freedisk

    Note: Remember that brace expansion uses the following format: ~/exampledirectory/{subdirectory1,subdirectory2,etc}

Now you will create a script that will execute various Linux tools to parse information about the system. Each of these tools should output results to a text file inside its respective system information directory.

  • For example: cpu_usage_tool > ~/backups/cpuuse/cpu_usage.txt

In the above example, the cpu_usage_tool command will output CPU usage information into a cpu_usage.txt file.

To get started with setting up your script up in your home directory, do the following:

  • Navigate to your home directory by running: cd ~/
  • Run the command nano system.sh to open a new Nano window.

Note: If you’re unsure how to get started, we included a system.sh starter file. Use that as a guide.

  1. Edit the system.sh script file so that it that does the following:
    • Prints the amount of free memory on the system and saves it to ~/backups/freemem/free_mem.txt.
    • Prints disk usage and saves it to ~/backups/diskuse/disk_usage.txt.
    • Lists all open files and saves it to ~/backups/openlist/open_list.txt.
    • Prints file system disk space statistics and saves it to ~/backups/freedisk/free_disk.txt.

    Note: For the free memory, disk usage, and free disk commands, make sure you use the -h option to make the output human-readable.

  2. Save this file and make sure to change or modify the system.sh file permissions so that it is executable.

You should now have an executable system.sh file within your home ~/ directory.

  • Test the script with sudo ./system.sh.
  • Note: If it appears, ignore the warning: lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1001/gvfs Output information may be incomplete.

Optional

  • Confirm the script ran properly by navigating to any of subdirectories in the ~/backup/ directory and using cat <filename> to view the contents of the backup files.

Bonus

  • Automate your script system.sh by adding it to the weekly system-wide cron directory.

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