如何实现文件空白行后续行追加至前一行的文本处理需求？

Got it, let's tackle this text processing task: you need to process a file such that any blank line triggers merging the lines that follow it directly onto the end of the line right before the blank line, with all blank lines removed entirely. Your example makes this super clear, so let's dive into solutions.

Example Reference #

Input content:

A B C 1

D E

B

Processed output:

A B C 1D EB

Python Solution #

This simple Python script will handle the task perfectly, and it's easy to adjust if your use case needs tweaks:

def merge_post_blank_lines(input_content):
    # Split content into lines, strip newline characters
    lines = [line.rstrip('\n') for line in input_content.splitlines()]
    merged_lines = []
    just_saw_blank = False

    for line in lines:
        if not line:  # We hit a blank line
            just_saw_blank = True
            continue
        
        if just_saw_blank:
            # Append this line to the last entry in our merged list
            merged_lines[-1] += line
            just_saw_blank = False
        else:
            merged_lines.append(line)
    
    # Join all merged segments into one final line (matches your example)
    return ''.join(merged_lines)

# Test with your sample input
sample_input = """A B C 1

D E

B"""
print(merge_post_blank_lines(sample_input))
# Output: A B C 1D EB

How This Works #

• First, we split the input into individual lines and clean up newline characters.
• The just_saw_blank flag tracks whether we just encountered a blank line—this tells us we need to append the next non-blank line to the previous one.
• When we hit a blank line, we set the flag and move on (we don't keep blank lines at all).
• If the flag is active, we add the current line's text to the last line we saved instead of creating a new entry.
• Finally, we join all the merged pieces into a single string, just like your example shows.

Command-Line Alternative (awk) #

If you'd rather use a shell command instead of a script, this awk one-liner does the same job:

awk 'NF { if (blank_seen) { printf "%s", $0; blank_seen=0 } else { printf "%s", $0 } } !NF { blank_seen=1 } END { print "" }' your_file.txt

• NF checks if a line is non-blank (has content).
• !NF checks if a line is blank.
• The blank_seen flag tracks when we need to append the next line to the previous output. We use printf instead of print to avoid adding newlines between merged segments.
• The END { print "" } adds a final newline to the output for clean formatting.

内容的提问来源于stack exchange，提问作者user1485267