我如何将 append 转换为来自 powershell 的 bash 变量？

Question

I am using WSL and need to get the computers IP address and append ":0.0". I execute a powershell command to get the IP address (random IP below) and assign that to a variable. Appending to that variable overwrites it.

> IP=$(powershell.exe "(Test-Connection -ComputerName (hostname) -Count 1).IPV4Address.IPAddressToString")
> echo $IP
127.27.15.1
> echo "${IP}:0.0"
:0.027.15.1

How do I get it to add it to the end instead of replacing the first 4 characters?

Answer 1

Remove the Windows line end from the value:

echo "${IP%$'\r'}:0.0"

Command substitution $(...) removes the final \n , but doesn't remove the \r that precedes it.

Parameter expansion ${var%pattern} removes the pattern from the end of the var's value. $'...' enables the ANSI C escapes.