使用Windows命令行将多行环境变量回显到文本文件

Question

I have an environment variable %SSH_PRIVATE_KEY% and would like to print this to a file using the command line, without using a batch file. This is because I need to use this file in a Gitlab-Ci .yml script.

In Linux, this is as simple as:

echo "$SSH_PRIVATE_KEY" > ~/.ssh/id_rsa 

And this generates:

-----BEGIN RSA PRIVATE KEY-----
DHHDpgIFFFFAQEA4s5JARKOiF/dfherreh/qeGLNaryra7rt927okJmonpJHyCbA5SRyjsST/oC
tJx+YJ0BaNbbHtpbjbMeWgqKPXNAIRng30TXCOLLKverteygerg/ererg/GVFfd5T1v/qY2rGCN
v9yHSw89upy8pA+HvAFFFFHDb2YUAgpyYMqCcZ3vGY0/NDBxQQwDKwrefqwef/wefweqe/wwALb 

And so on.

However in Windows, if I try:

echo "%SSH_PRIVATE_KEY%" >  C:\runner\builds\66092d15\0\myproject\.ssh\id_rsa

It generates this output:

"-----BEGIN RSA PRIVATE KEY-----

Because as soon as it reaches the newline character in %SSH_PRIVATE_KEY% it escapes the echo command.

How can I print the full %SSH_PRIVATE_KEY% to a file using the windows command line?

Answer 1

要获取所有行，请使用echo !VARIABLENAME!

echo !SSH_PRIVATE_KEY! >  C:\runner\builds\66092d15\0\myproject\.ssh\id_rsa

Answer 2

Actually Blue7 is right, but as he/she was down voted, here comes the long answer for anyone who did not read that this is gitlab-ci realted:

For ! to work DelayedExpansion must be enabled, and it seems to only work in batch-files. In gitlab this is the case by default. By default cmd will first expand the environment variable and then interpret it. Thus when you write echo "%SSH_PRIVATE_KEY%" cmd actually sees

echo "-----BEGIN RSA PRIVATE KEY-----
DHHDpgIFFFFAQEA4s5JARKOiF/dfherreh/qeGLNaryra7rt927okJmonpJHyCbA5SRyjsST/oC
...

Yes, including the " ! To avoid this, you need to enable late expansion setlocal EnableDelayedExpansion . With delayed expansion the environment variables are extended right before passing them to the application. Thus there is also no need for using " . Searching for EnableDelayedExpansion will provide you with lots of additional information.