Get value from a file to use in command in Powershell/CMD

Question

I want to be able to set a version number in a Powershell/CMD argument that is stored in a file. So let's say i have a long powershell/cmd command that has this argument in it py -m non_important_script --file-version={*get value from file*}

How would i get the version number that is stored in a file called version.py with one row of text in it:

__version__ = "1.2.0"

Basically i don't want to update this argument manually every time. It would be nice if i could always paste the same command into Powershell/CMD and it would put in the version number on it's own.

So far i've tried this py -m non_important_script --file-version=(Select-String -Path .\version.py -Pattern "\d.\d.\d").Matches.Groups[0].value, but it doesn't work and gives this error from the non_important_script:

FATAL:
Error, specify only one positional argument unless "--run" is specified to
pass them to the compiled program execution.

Mofi · Accepted Answer · 2023-01-01 09:25:56Z

0

A working Windows CMD solution suggested by Mofi is:

for /F "tokens=1* delims== " %I in (.\version.py) do if /I "%~I" == "__version__" py.exe -m non_important_script --file-version=%J

I managed to figure out a PowerShell solution as well continuing from what I already had in my question hoping there was some easy way to make it work and it turns out there was.

There must be created a variable like this and then end with a semicolon to allow the second command sequence to use the value of the variable:

$version = (Select-String -Path .\version.py -Pattern "\d.\d.\d").Matches.Groups[0].value ; py -m non_important_script --file-version=$version

edited Jan 1, 2023 at 9:25

Mofi

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answered Dec 31, 2022 at 14:50

Sea Wolf

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