将序列号折叠到bash中的范围 [英] Collapse sequential numbers to ranges in bash
问题描述
我正在尝试将序列号折叠为 bash 中的范围.例如,如果我的输入文件是
I am trying to collapse sequential numbers to ranges in bash. For example, if my input file is
1
2
3
4
15
16
17
18
22
23
45
46
47
我希望输出为:
1 4
15 18
22 23
45 47
如何在单行命令中使用 awk 或 sed 执行此操作?
How can I do this with awk or sed in a single line command?
感谢您的帮助!
推荐答案
$ awk 'NR==1{first=$1;last=$1;next} $1 == last+1 {last=$1;next} {print first,last;first=$1;last=first} END{print first,last}' file
1 4
15 18
22 23
45 47
说明
NR==1{first=$1;last=$1;next}
在第一行,初始化变量 first
和 last
并跳到下一行.
On the first line, initialize the variables first
and last
and skip to next line.
$1 == last+1 {last=$1;next}
如果此行从上一行开始,更新last
并跳转到下一行.
If this line continues in the sequence from the last, update last
and jump to the next line.
打印 first,last;first=$1;last=first
如果我们到了这里,我们的顺序就会中断.打印出最后一个序列的范围并重新初始化新序列的变量.
If we get here, we have a break in the sequence. Print out the range for the last sequence and reinitialize the variables for a new sequence.
END{打印第一个,最后一个}
到达文件末尾后,打印最终序列.
After we get to the end of the file, print the final sequence.
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