What is the difference between sorting numerically and alphabetically with the sort command?

The sort command in Linux can sort data both alphabetically and numerically, and the difference lies in how it interprets the data.

Alphabetical Sorting

• Default Behavior: The sort command sorts lines of text alphabetically by default.
• Character Comparison: It compares characters based on their ASCII values, meaning that uppercase letters come before lowercase letters.
• Example:

  echo -e "10\n2\n1\n20" | sort

  Output:

  1
  10
  2
  20

Numerical Sorting

• Using the -n Option: To sort numbers correctly, you can use the -n option, which treats the input as numerical values.
• Numerical Comparison: It compares the entire number rather than character by character.
• Example:

  echo -e "10\n2\n1\n20" | sort -n

  Output:

  1
  2
  10
  20

Summary

• Alphabetical Sorting: Sorts based on ASCII values, which can lead to unexpected results with numbers.
• Numerical Sorting: Sorts based on the actual numerical value, providing the correct order for numbers.

Use the -n option when you want to sort numbers to ensure they are ordered correctly.