SRT to TXT converter (removes lines 1, 2, 4)

srt_to_txt.sh

#!/bin/bash

# Input and output files
input_file="input.txt"
output_file="output.txt"

# Initialize line counter
line_counter=0

# Remove output file if it exists
> "$output_file"

# Read the input file line by line
while IFS= read -r line
do
    # Increment the line counter
    line_counter=$((line_counter + 1))

    # If line is 3rd in the group, write it to the output file
    if (( line_counter % 4 == 3 )); then
        echo "$line" >> "$output_file"
    fi

    # Reset the counter after every 4 lines
    if (( line_counter % 4 == 0 )); then
        line_counter=0
    fi
done < "$input_file"

echo "Finished processing the file. Output saved in $output_file."