Can I get or -and to work in PowerShell

Question

amp  amp  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  quot execute cmd1  and if successful  execute cmd2 quot   basically this  csc  t exe  out a exe SomeFile cs  amp  amp  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

User · Answer

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

User · Answer

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  quot    quot    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

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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

User · Answer

amp  amp  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

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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  quot command1  amp  amp  command2 quot   Here   amp  amp  is provided by cmd syntax described in this question

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Use  if  start-process filename1 exe     else  start-process filename2 exe   It s a little longer than  quot  amp  amp  quot   but it accomplishes the same thing without scripting and is not too hard to remember

User · Answer

In CMD    amp  amp   means  execute command 1  and if it succeeds  execute command 2    I have used it for things like   build  amp  amp  run tests   In PowerShell  the closest thing you can do is    build  -and  run tests    It has the same logic  but the output text from the commands is lost   Maybe it is good enough for you  though   If you re doing this in a script  you will probably be better off separating the statements  like this   build if            run tests     2019 11 27  The  amp  amp operator is now available for PowerShell 7 Preview 5    PS  gt  echo  Hello    amp  amp  echo  World   Hello  World

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I tried this sequence of commands in PowerShell  First Test PS C   gt   MyVar    quot C  MyTxt txt quot  PS C   gt    MyVar -ne  null  -and  Get-Content  MyVar  True    MyVar -ne  null  returned true and  Get-Content  MyVar  also returned true  Second Test PS C   gt   MyVar    null PS C   gt    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  The third test proved the second condition was not even analyzed  PS C   gt    MyVar -ne  null  -and  Get-Content  quot C  MyTxt txt quot   False    MyVar -ne  null  returned false and proved the second condition  Get-Content  quot C  MyTxt txt quot   never ran  by returning false on the whole command

User · Answer

Try this    errorActionPreference  Stop   csc  t exe  out a exe SomeFile cs  a exe

User · Answer

We can try this command instead of using  amp  amp  method  try  hostname  if   lastexitcode -eq 0   ipconfig  all   findstr  i bios   catch  echo err  finally

User · Answer

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

User · Answer

Just install PowerShell 7  go here  and scroll and expand the assets section   This release has implemented the pipeline chain operators

[syntax] Can I get "&&" or "-and" to work in PowerShell?

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