How to edit a .property file in powershell

问题

I have a application.properties file in following format

application.name=some thing
application.version=4.1.0.1
application.list=abc.def, ghi.jkl

Now my task is to append mno.pqr to application.list I am able to read it using

$AppProps = convertfrom-stringdata (get-content .\application.properties -raw)

I changed the Application.list value in $AppProps. How to save it back to original Application.properties file..?

回答1:

You can try the following:

$AppProps.GetEnumerator() | % { "$($_.Name)=$($_.Value)" } > .\application.properties

^{Note that > creates UTF-16 LE files (with BOM) by default, so if you want to control the encoding explicitly, pipe to either Out-File or Set-Content using the -Encoding parameter instead.}

There is no complementary ConvertTo-StringData, unfortunately, so you have to create your own output formatting (the default output format of a hashtable does not work as a properties file):

• ConvertFrom-StringData returns a hashtable, so $AppProps contains one.

• $AppProps.GetEnumerator() sends the hashtable's key/value pairs (dictionary entries of type [System.Collections.DictionaryEntry]) one by one through the pipeline.

  • The .GetEnumerator() call is necessary, because PowerShell treats a hashtable as a single object in a pipeline.

• % { "$($_.Name)=$($_.Value)" } constructs the output string for each key/value pair.

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Caveats that stem from using ConvertFrom-StringData to read properties files:

• Loss of ordering: Since key ordering is not guaranteed in a hashtable, the properties will typically appear in different order when you rewrite the file (at least the first time).

• Loss of comments: Comments in the input file (lines whose first non-blank char. is #) are quietly skipped on reading, so you'll lose them when you rewrite the file.

来源：https://stackoverflow.com/questions/35210352/how-to-edit-a-property-file-in-powershell