&&
is notoriously hard to search for on Google Search, but the best I've found is this article which says to use -and
.
Unfortunately it doesn't give any more information, and I can't find out what I'm supposed to do with -and
(again, a notoriously hard thing to search for).
The context I'm trying to use it in is "execute cmd1, and if successful, execute cmd2", basically this:
csc /t:exe /out:a.exe SomeFile.cs && a.exe
If you just want to run multiple commands on a single line and you don't care if the first one fails or not, you can use ;
For most of my purposes this is fine.
For example: kill -n myapp; ./myapp.exe
.
This question is related to
syntax
powershell
We can try this command instead of using && method:
try {hostname; if ($lastexitcode -eq 0) {ipconfig /all | findstr /i bios}} catch {echo err} finally {}
&& and || were on the list of things to implement (still are) but did not pop up as the next most useful thing to add. The reason is that we have -AND and -OR. If you think it is important, please file a suggestion on Connect and we'll consider it for V3.
Try this:
$errorActionPreference='Stop'; csc /t:exe /out:a.exe SomeFile.cs; a.exe
If your command is available in cmd.exe (something like python ./script.py
, but not PowerShell command like ii .
(this means to open the current directory by Windows Explorer)), you can run cmd.exe within PowerShell. The syntax is like this:
cmd /c "command1 && command2"
Here, &&
is provided by cmd syntax described in this question.
PS C:\> $MyVar = "C:\MyTxt.txt"
PS C:\> ($MyVar -ne $null) -and (Get-Content $MyVar)
True
($MyVar -ne $null)
returned true and (Get-Content $MyVar)
also returned true.
PS C:\> $MyVar = $null
PS C:\> ($MyVar -ne $null) -and (Get-Content $MyVar)
False
($MyVar -ne $null)
returned false and so far I must assume the (Get-Content $MyVar)
also returned false.
PS C:\> ($MyVar -ne $null) -and (Get-Content "C:\MyTxt.txt")
False
($MyVar -ne $null)
returned false and proved the second condition (Get-Content "C:\MyTxt.txt")
never ran, by returning false on the whole command.
It depends on the context, but here's an example of "-and" in action:
get-childitem | where-object { $_.Name.StartsWith("f") -and $_.Length -gt 10kb }
So that's getting all the files bigger than 10kb in a directory whose filename starts with "f".
A verbose equivalent is to combine $LASTEXITCODE
and -eq 0
:
msbuild.exe args; if ($LASTEXITCODE -eq 0) { echo 'it built'; } else { echo 'it failed'; }
I'm not sure why if ($?)
didn't work for me, but this one did.
I think a simple if
statement can accomplish this. Once I saw mkelement0's response that the last exit status is stored in $?, I put the following together:
# Set the first command to a variable
$a=somecommand
# Temporary variable to store exit status of the last command (since we can't write to "$?")
$test=$?
# Run the test
if ($test=$true) { 2nd-command }
So for the OP's example, it would be:
a=(csc /t:exe /out:a.exe SomeFile.cs); $test = $?; if ($test=$true) { a.exe }
Use:
if (start-process filename1.exe) {} else {start-process filename2.exe}
It's a little longer than "&&", but it accomplishes the same thing without scripting and is not too hard to remember.
Very old question, but for the newcomers: maybe the PowerShell version (similar but not equivalent) that the question is looking for, is to use -and
as follows:
(build_command) -and (run_tests_command)
Just install PowerShell 7 (go here, and scroll and expand the assets section). This release has implemented the pipeline chain operators.
Source: Stackoverflow.com