subnetCalculator.sh

Uses an IP address and a network mask to calculate information about the subnet.

Either displays information in the CLI, or prints the following documents to a user-set path:

• ipInfo.txt {Basic summary of the subnet}
• ipRange.json {Usable JSON file with all host IP addresses listed}
• ReadMe.txt {Gives information on potential host address issues.}

Current Bugs:

• Classful netmasks (/8, /16, & /24) result in bad data and script failure. Avoid these masks until further notice.

Misc. Notes

• ShellCheck command used for code review purposes: shellcheck --color=always --exclude=SC2039,SC2086,SC2116 [FILEPATH]

  • Omitted error code summary:
    • SC2039:
      • "In POSIX sh, string indexing is undefined."
      • "In POSIX sh, string replacement is undefined."
      • "In POSIX sh, brace expansion is undefined."
    • SC2086: "Double quote to prevent globbing and word splitting.""
    • SC2116: "Useless echo? Instead of cmd $(echo foo), just use cmd foo."

• Website used to verify accuracy of calculations: Online Subnet Calculator