#!/bin/bash

if [ $# -ne 1 ]; then
    echo "Usage: $0 <filename>"
    exit 1
fi

file="$1"

# Check if file exists
if [ ! -f "$file" ]; then
    echo "Error: File '$file' does not exist"
    exit 1
fi

# Calculate average line length and store line lengths with their content
avg_length=$(awk '{ 
    total_length += length($0)
    count++
} 
END { 
    if (count > 0) printf "%.0f", total_length/count 
}' "$file")

# Find the line closest to average length
awk -v target=$avg_length '
{
    curr_length = length($0)
    diff = sqrt((curr_length - target)^2)
    if (NR == 1 || diff < min_diff) {
        min_diff = diff
        closest_line = $0
        line_num = NR
        actual_length = curr_length
    }
}
END {
    print "Average line length: " target
    print "Closest matching line (#" line_num "):"
    print closest_line
    print "Length: " actual_length
}' "$file"