@(At) Sign in File Path/String

@(at) sign in file path/string

It has nothing to do with filepath. It changes the escaping behavior of strings.

In a string literal prefixed with @ the escape sequences starting with \ are disabled. This is convenient for filepaths since \ is the path separator and you don't want it to start an escape sequence.

In a normal string you would have to escape \ into \\ so your example would look like this "pdf\\". But since it's prefixed with @ the only character that needs escaping is " (which is escaped as "") and the \ can simply appear.

This feature is convenient for strings literals containing \ such as filepaths or regexes.

For your simple example the gain isn't that big, but image you have a full path "C:\\ABC\\CDE\\DEF" then @"C:\ABC\CDE\DEF" looks a lot nicer.

For regular expressions it's almost a must. A regex typically contains several \ escaping other characters already and often becomes almost unreadable if you need to escape them.

using @ to locate file via string

It changes the escaping behavior of strings. When using @ we don't need to escape \ character.

As the path should be in this manner:

"C:\\abc.txt"

Search for a file and assign a path as a variable as a string

The object returned from Get-ChildItem is a a FileInfo object with many properties you can query. So you can store the result in a variable:

$file = Get-ChildItem $env:APPDATA -Recurse -Include yourfilename.ext

You can then query the parent directory using the Directory property:

$file.Directory

Adding an @ symbol before a string in C#

If you are passing agrument at runtime use quotes to "close" its value within:

C:\your_console_application "arg_1_value" "arg 2 value"

this will be exctracted inside appliaction as:

args[0] -> arg_1_value

args[1] -> arg 2 value

What's the @ in front of a string in C#?

It marks the string as a verbatim string literal - anything in the string that would normally be interpreted as an escape sequence is ignored.

So "C:\\Users\\Rich" is the same as @"C:\Users\Rich"

There is one exception: an escape sequence is needed for the double quote. To escape a double quote, you need to put two double quotes in a row. For instance, @"""" evaluates to ".

How do I use Join-Path to combine more than two strings into a file path?

You can use the .NET Path class:

[IO.Path]::Combine('C:\', 'Foo', 'Bar')

Get full path of the files in PowerShell

Add | select FullName to the end of your line above. If you need to actually do something with that afterwards, you might have to pipe it into a foreach loop, like so:

get-childitem "C:\windows\System32" -recurse | where {$_.extension -eq ".txt"} | % {
     Write-Host $_.FullName
}

How do I get the file name from a String containing the Absolute file path?

just use File.getName()

File f = new File("C:\\Hello\\AnotherFolder\\The File Name.PDF");
System.out.println(f.getName());

using String methods:

  File f = new File("C:\\Hello\\AnotherFolder\\The File Name.PDF");  
System.out.println(f.getAbsolutePath().substring(f.getAbsolutePath().lastIndexOf("\\")+1));

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