使用awk将头中的第一个字添加到文件的所有后续行

我有一个文件，头记录后面跟着详细信息行。我希望使用awk将单词从标题标记到文件中的后续行。。每个标题记录中都有一个特定的单词“Header”

我的示例文件是

h1_val  header
this is line 1 under header set1
this is line 2 under header set1
this is line 3 under header set1
this is line 4 under header set1
h2_val  header
this is line 1 under header set2
this is line 2 under header set2
this is line 3 under header set2
this is line 4 under header set2

我的输出应该是

h1_val this is line 1 under header set1
h1_val this is line 2 under header set1
h1_val this is line 3 under header set1
h1_val this is line 4 under header set1
h2_val this is line 1 under header set2
h2_val this is line 2 under header set2
h2_val this is line 3 under header set2
h2_val this is line 4 under header set2

请帮忙

谢谢

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谢谢ghoti，如果线条清晰的话，看起来效果不错。。 如果我的输入看起来像逗号分隔的并且带有双引号。。。awk应该是什么变化

"h1_val","header word" 
"this is line 1","under header","set1" 
"this is line 2","under header","set1" 
"this is line 2","under header","set1" 
"this is line 2","under header","set1" 
"h2_val","header word" 
"this is line 1","under header","set2" 
"this is line 2","under header","set2" 
"this is line 2","under header","set2" 
"this is line 2","under header","set2" 

谢谢

这似乎可以做到

$ awk '$2=="header"{h=$1;next} {printf("%s ",h)} 1' input.txt
h1_val this is line 1 under header set1
h1_val this is line 2 under header set1
h1_val this is line 3 under header set1
h1_val this is line 4 under header set1
h2_val this is line 1 under header set2
h2_val this is line 2 under header set2
h2_val this is line 3 under header set2
h2_val this is line 4 under header set2

或者，如果您愿意，这只是功能上的等效：

$ awk '$2=="header"{h=$1;next} {print h OFS $0}' input.txt

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请注意，这意味着您的标题文本没有空格。如果是这样，那么您可能需要做一些比

$2==“header”

更奇特的事情来查找您的头。如果是这种情况，请提供更多详细信息。

谢谢ghoti，如果线条清晰，效果似乎很好。。如果我的输入看起来像逗号分隔的并且带有双引号。。。awk应为“h1_val”、“标题词”“这是第1行”、“标题下”、“set1”“这是第2行”、“标题下”、“set1”“这是第2行”、“标题下”、“set1”“这是第2行”、“标题下”、“set1”“h2_val”、“标题词”“这是第1行”、“标题下”、“set2”“这是第2行”、“标题下”、“set2”“这是第2行”，“在标题下”、“设置2”这是第2行、“在标题下”、“设置2”“谢谢！！正如我在回答中所暗示的，如果有细节可以改善你得到的答案，你应该点击你问题下的链接，并用更多细节更新你的问题。StackOverflow注释的格式很糟糕。请更新您的问题，我将更新我的答案。哦，我要提到的是，逗号+引号分隔的文本不太可能被awk完美地处理。如果逗号是字段分隔符，awk不知道引号内逗号和引号外逗号的区别。当然，如果你的引号里没有逗号，你应该没事。我试过这样。。。但它不会在第一个单词后添加逗号…任何输入都是非常感谢的…谢谢！！awk-F，'$2==“\”标题词\'{h=$1；next}{printf（“%s”，h）}1”输入。TXT最终解决了这个问题……awk-F，'$2==“\”标题词\'{h=$1；next}{printf（“%s，”，h）}1”输入。TXT为什么不首先指定这些条件？

> awk '{if($2=="header")p=$1;else print p,$0}' temp2
h1_val this is line 1 under header set1
h1_val this is line 2 under header set1
h1_val this is line 3 under header set1
h1_val this is line 4 under header set1
h2_val this is line 1 under header set2
h2_val this is line 2 under header set2
h2_val this is line 3 under header set2
h2_val this is line 4 under header set2