如何在Perl中替换现有文件中的字符串? [英] How to replace a string in an existing file in Perl?

问题描述

我想在所有名为1_classification.dat，2_classification.dat等的文本文件中将单词"blue"替换为"red".我想编辑相同的文件，所以尝试了此代码，但是它不起作用.我要去哪里错了?

I want to replace word "blue" to "red" in all text files named as 1_classification.dat, 2_classification.dat and so on. I want to edit the same file so I tried this code but it does not work. Where am I going wrong?

@files=glob("*_classification.dat");
foreach my $file (@files)
{
    open(IN,$file) or die $!;
    <IN>;
    while(<IN>)
    {
       $_='~s/blue/red/g';
       print IN $file;
    }

   close(IN)
}

推荐答案

单衬管有什么问题吗?

$ perl -pi.bak -e 's/blue/red/g' *_classification.dat

---

说明

• -p处理，然后逐行打印<>
• -i激活就地编辑.使用.bak扩展名
备份文件
• 正则表达式替换作用于隐式变量，它们是文件内容，逐行显示

• -p processes, then prints <> line by line
• -i activates in-place editing. Files are backed up using the .bak extension
• The regex substitution acts on the implicit variable, which are the contents of the file, line-by-line

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