PowerShell: return error exit code if not match a string

Question

I found that

$(Invoke-Expression hostname) -eq 'mycomputername'

Whether it is matched or not, the exitcode must be 0 this behavior is different from linux ,i.e, if not match error code exit 1

Is there any short command in PowerShell that can return error exit code if doesn't match the string?

CB. · Accepted Answer · 2014-02-20 08:45:48Z

32

In an script you can change exit code using exit keyword.

A normal termination will set the exitcode to 0

An uncaught THROW will set the exitcode to 1

The EXIT statement will stop the process and set the exitcode to whatever is specified.

In your case I'ld do something like this

if ( $(hostname) -eq 'mycomputername')
{
  exit 0
}
else
{
  exit 1
}

answered Feb 20, 2014 at 8:45

CB.

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1 Comment

JamesQMurphy Over a year ago

An uncaught THROW did not set the exitcode to1 for me, on PowerShell v3.0.

Brad Merrill · Accepted Answer · 2016-10-13 16:46:21Z

1

Minor update, you can simplify this these days:

powershell -command "if($(Invoke-Expression hostname) -ne 'wrongname'){ exit 1 }"
echo Error=%ERRORLEVEL%

answered Oct 13, 2016 at 16:46

Brad Merrill

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Comments

vonPryz · Accepted Answer · 2014-02-20 08:48:38Z

0

Are you looking for something like this?

C:\>powershell -command "& { if($(Invoke-Expression hostname) -eq 'wrongname'){ exit 0 } else { exit 1 }  } "
C:\>echo %errorlevel%
1

C:\>powershell -command "& { if($(Invoke-Expression hostname) -eq 'rightname'){ exit 0 } else { exit 1 }  } "
C:\>echo %errorlevel%
0

answered Feb 20, 2014 at 8:48

vonPryz

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5 Comments

Kit Ho Over a year ago

yes you are right is there any better way to do ? looks like very clusmy

vonPryz Over a year ago

@KitHo Might be. Can you explain a bit more what you are trying to achieve? Streamlining depends on intended use case.

Kit Ho Over a year ago

What i want to achieve is that compare the hostname , it is matched string, it will return exit code 0, otherwise return exit code 1

vonPryz Over a year ago

@KitHo Look up the XY problem.

Kit Ho Over a year ago

what do u mean XY problem

mjolinor · Accepted Answer · 2014-02-20 11:27:50Z

0

If you're wanting it more succint,

powershell -command "& { if($(Invoke-Expression hostname) -ne 'wrongname'){ exit 1 } }"

edited Feb 20, 2014 at 11:27

answered Feb 20, 2014 at 11:20

mjolinor

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