用从另一个文件复制的内容替换文件中的字符串 [英] Replace a string in a file with contents copied from another file

问题描述

我已经弄清楚了，并尝试在gsed -i命令的帮助下替换字符串，如下所示:

I have figured out and tried replacing strings with the help of gsed -i command like this:

gsed -i 's/sdkUniqueKey=""/sdkUniqueKey="123"/g' AppConstants.txt

现在我想对文件中的另一个字符串执行相同的操作，但是正如我的问题所指出的那样，我需要先从另一个文件中复制内容，然后替换一个字符串，例如:

Now I want to do the same operation on another string in my file but as my question states, I need to copy the contents from a different file first and then replace a string, something like:

gsed -i 's/sdkPrivateKey=""/sdkPrivateKey="contentsCopiedFromAnotherFile"/g' AppConstants.txt

还有一件事，内容(要复制)具有下一行和空白，我想在复制之前将其删除.还带有反斜杠和正斜杠，希望他们在替换内容时不会造成任何问题).这是我要复制的内容:

One more thing, the contents (to be copied), have next line and white space in it, which I would like to remove before copying. Also it has backslash and forward slashes, hope they don't create any issues while replacing the content). Here is what I am trying to copy:

-----BEGIN PRIVATE KEY-----
MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQDNGillPEfz8d7W
0fyJejF9AYeo8OowcdOcxrpzs4IiXCwPEP1MOHAaOwGTdMwSAeQjw9WOYpE1q+DU
I+Zhh4DVUR8dIdYQtXe+oK/QfhVQMJ3AjTKRvhUmFciGwxXlnLBIkN/ePplNdq9Z
Y5DrSR0lE8X2dD+ZRAkQRpsY8TE48b9f443sbsU4sMvNaxd2XTxe2TLYRvB00w6Q
3lqZiKLzttINBCPoCjhJwBdhcF/LHsCmYhfElPqJxH27BTGBOnbICdmazdnChXQg
3hhsbJmnNDe17Spw0lY
-----END PRIVATE KEY-----

我也可以将文件的内容复制到变量中:

I am able to copy the contents of a file into a variable as well:

contents ="`cat fileToBeRead`"

我需要做的就是从此字符串中删除空格和换行，并在我的gsed命令中使用此"contents"变量

All I need is to remove white spaces and new lines from this string and use this "contents" variable in my gsed command

推荐答案

如果我已经正确理解了您的问题，则可以使用以下方法解决问题:

If I have properly understood your question, the following should do the trick:

#!/bin/bash

fileToBeRead="key.txt" #Whatever

var=$(tr -d '[:blank:]\n' < $fileToBeRead)
sed -i "s#sdkPrivateKey=\"\"#sdkUniqueKey=\"$var\"#g" AppConstants.txt

由于键中包含反斜杠/斜杠，因此您应该对sed使用不同的分隔符(例如#)，否则句子将被错误地解析.

Since the key contains backslashes/slashes you should use a different separator for sed (e.g. #) or the sentence will be misparsed.

KEY="$var" perl -pi -e 's/sdkPrivateKey=""/sdkUniqueKey="$ENV{KEY}"/g' AppConstants.txt

为了避免sed的分隔符问题，可以使用

perl代替sed.在下面查看@DennisWilliamson的评论.

perl can be used instead of sed in order to avoid sed's separator issues. Check out @DennisWilliamson's comment below.

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