bash 如何在没有中间文件的情况下区分两个文件的顶行
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How to diff top lines of two files without intermediate file
提问by Tom97531
I have 2 big files and I want to make a diff between the top lines of each files, but i don't want to use intermediate files. I would like to do something like that :
我有 2 个大文件，我想在每个文件的顶行之间进行区分，但我不想使用中间文件。我想做这样的事情：
diff `head -n 2000 file1.log` `head -n 2000 file2.log`
I remember I've done something like that a long time ago, ie. make a command like head -n 2000 file1.loginterpreted as a file. But I don't remember how. Maybe it was another shell...
Thank you.
我记得很久以前我做过类似的事情，即。使命令像head -n 2000 file1.log解释为文件。但我不记得如何。也许它是另一个外壳...
谢谢。
回答by Mark Longair
You're probably thinking of process substitutionin bash. For example, try:
您可能正在考虑bash 中的进程替换。例如，尝试：
diff <(head -n 2000 file1.log) <(head -n 2000 file2.log)
