Type: Debugger
Input information below

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Describe the bug

• OS and Version: Linux (RHEL 7.6)
• VS Code Version: 1.36.1
• C/C++ Extension Version: 0.24.1
• Other extensions you installed (and if the issue persists after disabling them): It does
• The Illegal Variable Name error is displayed when trying to pick a remote process on a host which has CShell as the default shell. This seems to stem from the fact that bash is the assumed shell and $(uname) isn't valid in cshell. (the equivalent would be `uname`)

Unfortunately it's not possible to change the default shell on the remote host to bash, since other processes rely on the default shell being CShell.

To Reproduce
Please include a code sample and launch.json configuration.
Steps to reproduce the behavior:

1. Configure launch.json to connect to a remote host with csh as default shell
2. Attempt to connect
3. Error appears:
   Command failed: "/usr/bin/ssh" "-i" "~/.ssh/private_key" "user@remote-host" 'sh -c "uname && if [ $(uname) = "Linux" ] ; then ps axww -o pid=,comm=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,args= ; elif [ $(uname) = "Darwin" ] ; then ps axww -o pid=,comm=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,args= -c; fi"'
   Illegal variable name.

My launch.json (with some stuff genericised):

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
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    "version": "0.2.0",
    "configurations": [
        {
            "name": "debug process remote_server",
            "type": "cppdbg",
            "request": "attach",
            "program": "${workspaceRoot}/debug64/bin/process",
            "processId": "${command:pickRemoteProcess}",
            "MIMode": "gdb",
            "pipeTransport": {
                "pipeCwd": "/usr/bin",
                "pipeProgram": "/usr/bin/ssh",
                "pipeArgs": ["-i", "~/.ssh/private_key", "user@remote_server"],
                "debuggerPath": "/usr/bin/gdb"
            },
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        }
    ]
}

Additional context
If applicable, please include logging by adding "logging": { "engineLogging": true, "trace": true, "traceResponse": true } in your launch.json
Add any other context about the problem here including log or error messages in your Debug Console or Output windows.