我在Python中有一个实用程序脚本:
I have a utility script in Python:
#!/usr/bin/env python import sys unique_lines = [] duplicate_lines = [] for line in sys.stdin: if line in unique_lines: duplicate_lines.append(line) else: unique_lines.append(line) sys.stdout.write(line) # optionally do something with duplicate_lines这个简单的功能(uniq,无需先排序,保持稳定的顺序)必须作为一个简单的UNIX实用程序提供,不是吗?也许是管道中的过滤器组合?
This simple functionality (uniq without needing to sort first, stable ordering) must be available as a simple UNIX utility, mustn't it? Maybe a combination of filters in a pipe?
问的原因:在无法从任何地方执行Python的系统上需要此功能.
Reason for asking: needing this functionality on a system on which I cannot execute Python from anywhere.
推荐答案UNIX Bash脚本博客建议:
The UNIX Bash Scripting blog suggests:
awk '!x[$0]++'此命令告诉awk要打印哪些行.变量$0包含一行的全部内容,方括号可用于数组访问.因此,对于文件的每一行,如果先前未设置该节点的内容(!),则数组x的节点将递增,并打印该行.
This command is telling awk which lines to print. The variable $0 holds the entire contents of a line and square brackets are array access. So, for each line of the file, the node of the array x is incremented and the line printed if the content of that node was not (!) previously set.
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删除重复的行而不进行排序
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