Removing characters from a string

Hi there,

I have a variable, $test, that contains the full path to a file on my
machine. What I wish to accomplish is remove everything from the string
except the filename minus the extension. The former is easy to accomplish
with the split-path cmdlet (split-path $test -leaf). However, I can't seem
to find out how to remove the file extension. The file is a PowerShell
script, and so has an extension of .ps1.

Thanks in advance,

-SDL

Theres a couple of ways that come to mind:

This one takes the output from split-path and uses the Replace function of
Strings to remove the extension. It would also be possible to use the
substring or remove functions if you knew the length of the name of the file

PS> $test = "C:\WINDOWS\system32\windowspowershell\v1.0\eula.txt"
PS> $fname = (Split-Path $test -leaf).ToString().Replace(".txt", "")
PS> $fname
eula
PS>

Alternatively a more direct way is to use the .Net Path class'
GetFileNameWithoutExtension method which will return the name of the file
without the extension

PS> $test = "C:\WINDOWS\system32\windowspowershell\v1.0\eula.txt"
PS> $fname = [System.IO.Path]::GetFileNameWithoutExtension($test)
PS> $fname
eula
PS>


--
Richard Siddaway

Please note that all scripts are supplied "as is" and with no warranty


"Samuel Denbigh Leslie" wrote:

> Hi there,
>
> I have a variable, $test, that contains the full path to a file on my
> machine. What I wish to accomplish is remove everything from the string
> except the filename minus the extension. The former is easy to accomplish
> with the split-path cmdlet (split-path $test -leaf). However, I can't seem
> to find out how to remove the file extension. The file is a PowerShell
> script, and so has an extension of .ps1.
>
> Thanks in advance,
>
> -SDL
>
>
>

I'd use .NET's io.path ... like so:

PS ps:\> $fp = "c:\windows\system32\bubbles.scr"
PS ps:\> [io.path]::GetFileNameWithoutExtension($fp)
bubbles

You can get a list of the static methods provided by io.path:

PS ps:\> [io.path] | gm -static


--

gaurhoth
http://gaurhothw.spaces.live.com/


"Samuel Denbigh Leslie" <samuel.denbigh.leslie@gmail.com> wrote in message news:eRPsUcOLHHA.2028@TK2MSFTNGP03.phx.gbl...
> Hi there,
>
> I have a variable, $test, that contains the full path to a file on my
> machine. What I wish to accomplish is remove everything from the string
> except the filename minus the extension. The former is easy to accomplish
> with the split-path cmdlet (split-path $test -leaf). However, I can't seem
> to find out how to remove the file extension. The file is a PowerShell
> script, and so has an extension of .ps1.
>
> Thanks in advance,
>
> -SDL
>
>

another way :

PoSH>$t = gi TabExpansion.ps1

PoSH>$t.FullName.Replace( $t.Extension,'')
C:\PowerShell\PowerTab\TabExpansion

PoSH>$t.Name.Replace( $t.Extension,'')
TabExpansion

gr /\/\o\/\/

"Gaurhoth" <gaurhoth@live.com> wrote in message news:uqM13JQLHHA.3668@TK2MSFTNGP02.phx.gbl...
I'd use .NET's io.path ... like so:

PS ps:\> $fp = "c:\windows\system32\bubbles.scr"
PS ps:\> [io.path]::GetFileNameWithoutExtension($fp)
bubbles

You can get a list of the static methods provided by io.path:

PS ps:\> [io.path] | gm -static


--

gaurhoth
http://gaurhothw.spaces.live.com/


"Samuel Denbigh Leslie" <samuel.denbigh.leslie@gmail.com> wrote in message news:eRPsUcOLHHA.2028@TK2MSFTNGP03.phx.gbl...
> Hi there,
>
> I have a variable, $test, that contains the full path to a file on my
> machine. What I wish to accomplish is remove everything from the string
> except the filename minus the extension. The former is easy to accomplish
> with the split-path cmdlet (split-path $test -leaf). However, I can't seem
> to find out how to remove the file extension. The file is a PowerShell
> script, and so has an extension of .ps1.
>
> Thanks in advance,
>
> -SDL
>
>

This way may not work:

1) paths and file names can contain the same string as extension several times:

MyFile.txt.txt -> MyFile (.txt replaced with '')
My.docs\File.doc -> Mys\File (.doc replaced with '')

2) .Replace() is case sensitive, is not it? Paths are not.

--
Thanks,
Roman Kuzmin

you can use the old way:

echo
$file.substring($file.lastindexofany("\")+1,($file.indexof(".")-1)-$file.lastindexofany("\"))

it works on a file path with single or multiple extensions

$hay
http://scriptolog.blogspot.com




"Samuel Denbigh Leslie" <samuel.denbigh.leslie@gmail.com> wrote in message
news:eRPsUcOLHHA.2028@TK2MSFTNGP03.phx.gbl...
> Hi there,
>
> I have a variable, $test, that contains the full path to a file on my
> machine. What I wish to accomplish is remove everything from the string
> except the filename minus the extension. The former is easy to accomplish
> with the split-path cmdlet (split-path $test -leaf). However, I can't seem
> to find out how to remove the file extension. The file is a PowerShell
> script, and so has an extension of .ps1.
>
> Thanks in advance,
>
> -SDL
>

Can always use

tolower().replace()

which removes case sensitivity

which won't matter if need to refer back to the file as Windows isn't case
sensitive on file names or paths
--
Richard Siddaway

Please note that all scripts are supplied "as is" and with no warranty


"Roman Kuzmin" wrote:

> This way may not work:
>
> 1) paths and file names can contain the same string as extension several times:
>
> MyFile.txt.txt -> MyFile (.txt replaced with '')
> My.docs\File.doc -> Mys\File (.doc replaced with '')
>
> 2) .Replace() is case sensitive, is not it? Paths are not.
>
> --
> Thanks,
> Roman Kuzmin
>

Also, there's the option of using a capturing regex.

If $test is the filename.extension

$test -match "(^.+)\..+"
$filename = $matches[1]

If $test is the full path

$test -match "^.+\\(.+)\..+"
$filename = $matches[1]

"Samuel Denbigh Leslie" wrote:

> Hi there,
>
> I have a variable, $test, that contains the full path to a file on my
> machine. What I wish to accomplish is remove everything from the string
> except the filename minus the extension. The former is easy to accomplish
> with the split-path cmdlet (split-path $test -leaf). However, I can't seem
> to find out how to remove the file extension. The file is a PowerShell
> script, and so has an extension of .ps1.
>
> Thanks in advance,
>
> -SDL
>
>
>