Заголовок: “Elegance in Simplicity: Calculating Averages with a Single Line of Bash Script”

In the world of programming, elegance often manifests itself in simplicity. When it comes to processing and analyzing data on the command line, efficiency and brevity can be just as beautiful as any complex algorithm. One such example of this elegance is a one-liner Bash script for calculating the average of a set of values from standard input.

Imagine you have a collection of numerical values and you want to quickly compute their average without the need for extensive code or external tools. Look no further than this elegant Bash script:

awk '{ sum += $1 } END { print sum / NR }'

This one-liner employs the power of the ‘awk’ command, a versatile text processing tool, to perform the task seamlessly. Let’s break it down:

  • awk: This is the command used for text processing and manipulation.
  • '{ sum += $1 }': Here, we tell ‘awk’ to accumulate the sum of values found in the first column (denoted by $1).
  • 'END { print sum / NR }': After processing all the input, the script prints the calculated sum divided by the number of records (lines) processed, which is represented by ‘NR,’ an internal ‘awk’ variable.

What makes this script beautiful is its simplicity and conciseness. It efficiently handles the task of calculating an average from a stream of values, whether you input them manually or pipe them from another command. It’s a testament to the power of Unix-like systems and their ability to perform complex tasks elegantly with minimal code.

Example:
echo -e "10\n5\n10\n5" | awk '{ sum += $1 } END { print sum / NR }'
=7.5

So, the next time you find yourself needing to compute averages on the command line, remember this elegant one-liner. Its beauty lies in its simplicity, and sharing it with others can help spread the joy of efficient, elegant solutions in the world of programming.

By Oliver

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