Parentheses around foreach in Powershell-CodePudding

For context, I'm trying to run multiple powershell commands in a single line of code so that I can use it in a Dockerfile.

($SubInterfaceInfo = netsh interface ipv4 show subinterface) -and ($vEthernetInterfaces = (($SubInterfaceInfo | Where-Object { $_ -match 'vEthernet' }) -split '\s\s')[-1]) -and (foreach($vEthernetInterface in $vEthernetInterfaces){ netsh interface ipv4 set subinterface $vEthernetInterface mtu=1460 })

When run, I get the error:

Unexpected token 'in' in expression or statement.

Individually all of these commands work, however, the parentheses around the foreach seems to be the cause of the problem.

This command works:

foreach($vEthernetInterface in $vEthernetInterfaces){ netsh interface ipv4 set subinterface $vEthernetInterface mtu=1460 }

But this causes the error:

(foreach($vEthernetInterface in $vEthernetInterfaces){ netsh interface ipv4 set subinterface $vEthernetInterface mtu=1460 })

Is a way I can make the foreach command work inside the parentheses, or another way of using the foreach loop with -and?

CodePudding user response：

The grouping operator, (...), is primarily meant for constructing nested pipelines, and you must therefore provide a valid pipeline expression (eg. call a cmdlet, evaluate a variable expression, etc.) as the first statement.

To nest control flow expressions like the foreach loop, use the subexpression operator $(...):

$(foreach($vEthernetInterface in $vEthernetInterfaces){ netsh interface ipv4 set subinterface $vEthernetInterface mtu=1460 })