conditional execution (&& and ||) in powershell
2019: the Powershell team are considering adding support for &&
to Powershell - weigh in at this GitHub PR
Try this:
$(command -arg1 -arg2 | Out-Host;$?) -and $(command2 -arg1 | Out-Host;$?)
The $()
is a subexpression allowing you to specify multiple statements within including a pipeline. Then execute the command and pipe to Out-Host
so you can see it. The next statement (the actual output of the subexpression) should output $?
i.e. the last command's success result.
The $?
works fine for native commands (console exe's) but for cmdlets it leaves something to be desired. That is, $?
only seems to return $false
when a cmdlet encounters a terminating error. Seems like $?
needs at least three states (failed, succeeded and partially succeeded). So if you're using cmdlets, this works better:
$(command -arg1 -arg2 -ev err | Out-Host;!$err) -and $(command -arg1 -ev err | Out-Host;!$err)
This kind of blows still. Perhaps something like this would be better:
function ExecuteUntilError([scriptblock[]]$Scriptblock){ foreach ($sb in $scriptblock) { $prevErr = $error[0] . $sb if ($error[0] -ne $prevErr) { break } }}ExecuteUntilError {command -arg1 -arg2},{command2-arg1}
Powershell 7 preview 5 has them. I don't know why this was deleted with no notification or explanation. https://devblogs.microsoft.com/powershell/powershell-7-preview-5/ This will give the output of both commands, as the question requested.
echo 'hello' && echo 'there'hellothereecho 'hello' || echo 'there'hello
To simplify multistep scripts where doThis || exit 1 would be really useful, I use something like:
function ProceedOrExit { if ($?) { echo "Proceed.." } else { echo "Script FAILED! Exiting.."; exit 1 } }doThis; ProceedOrExitdoNext# or for long doosdoThisProceedOrExitdoNext