如何使用 PowerShell 替换文件中的多个字符串 [英] How to replace multiple strings in a file using PowerShell

问题描述

我正在编写用于自定义配置文件的脚本.我想替换此文件中的多个字符串实例，并尝试使用 PowerShell 来完成这项工作.

I am writing a script for customising a configuration file. I want to replace multiple instances of strings within this file, and I tried using PowerShell to do the job.

单次替换效果很好，但是多次替换很慢，因为每次都要重新解析整个文件，而且这个文件非常大.脚本如下所示:

It works fine for a single replace, but doing multiple replaces is very slow because each time it has to parse the whole file again, and this file is very large. The script looks like this:

$original_file = 'path\filename.abc'
$destination_file =  'path\filename.abc.new'
(Get-Content $original_file) | Foreach-Object {
    $_ -replace 'something1', 'something1new'
    } | Set-Content $destination_file

我想要这样的东西，但我不知道怎么写:

I want something like this, but I don't know how to write it:

$original_file = 'path\filename.abc'
$destination_file =  'path\filename.abc.new'
(Get-Content $original_file) | Foreach-Object {
    $_ -replace 'something1', 'something1aa'
    $_ -replace 'something2', 'something2bb'
    $_ -replace 'something3', 'something3cc'
    $_ -replace 'something4', 'something4dd'
    $_ -replace 'something5', 'something5dsf'
    $_ -replace 'something6', 'something6dfsfds'
    } | Set-Content $destination_file

推荐答案

一种选择是将 -replace 操作链接在一起.每行末尾的 ` 转义换行符，导致 PowerShell 继续解析下一行的表达式:

One option is to chain the -replace operations together. The ` at the end of each line escapes the newline, causing PowerShell to continue parsing the expression on the next line:

$original_file = 'path\filename.abc'
$destination_file =  'path\filename.abc.new'
(Get-Content $original_file) | Foreach-Object {
    $_ -replace 'something1', 'something1aa' `
       -replace 'something2', 'something2bb' `
       -replace 'something3', 'something3cc' `
       -replace 'something4', 'something4dd' `
       -replace 'something5', 'something5dsf' `
       -replace 'something6', 'something6dfsfds'
    } | Set-Content $destination_file

另一种选择是分配一个中间变量:

Another option would be to assign an intermediate variable:

$x = $_ -replace 'something1', 'something1aa'
$x = $x -replace 'something2', 'something2bb'
...
$x

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