Write a text file in Appveyor script - command-line

Question

I have a problem when writing a simple text file with appveyor. Here is the simple script:
version: 1.0.{build}-{branch}
shallow_clone: true
environment:
matrix:
- APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
TOOLSET: msvc-14.1
ARCH: x86_64
install:
build: off
test_script:
- echo ^<Where are my symbols^> > hello.txt
- more hello.txt
This leads to an error in the console:
Build started
Fetching repository commit (2be7d4b)...OK
Total: 274 bytes in 1 files
echo ^<Where are my symbols^> > hello.txt
Command exited with code 1
I have tried the commands in on desktop but everything is working.

Answer 1

This escape symbol will not work this way because internally we use call before your cmd when executing command from the custom PowerShell host.
Workarounds:
Use PowerShell
test_script:
- ps: Set-Content -Value "<Where are my symbols>" -Path .\hello.txt
- more hello.txt
Check-in .cmd file with your command which uses ^ escape symbol and run it.