{"id":703,"date":"2010-07-19T12:12:23","date_gmt":"2010-07-19T17:12:23","guid":{"rendered":"http:\/\/jdhitsolutions.com\/blog\/2010\/07\/export-function\/"},"modified":"2010-07-19T13:25:57","modified_gmt":"2010-07-19T18:25:57","slug":"export-function","status":"publish","type":"post","link":"https:\/\/jdhitsolutions.com\/blog\/scripting\/703\/export-function\/","title":{"rendered":"Export-Function"},"content":{"rendered":"

I love that you can do so much with PowerShell on the fly.\u00a0 For example, I don\u2019t need to launch a script editor to create a PowerShell function. I can do it right from the command prompt.<\/p>\n

PS C:\\> function tm {(get-date).ToLongTimeString()}
\nPS C:\\> tm
\n12:41:27 PM<\/span><\/p>\n

As long as my PowerShell session is open, I can use the tm function. I can create as many other functions on the fly as I wish.\u00a0 Most of the time when I do this, the function is a throw-away. But occasionally I create a function from the command prompt that I\u2019d like to keep.\u00a0 I can see that the function object has a definition:<\/p>\n

PS C:\\> dir function:tm <\/span><\/p>\n

CommandType\u00a0\u00a0\u00a0\u00a0 Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Definition
\n-----------\u00a0\u00a0\u00a0\u00a0 ----\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ----------
\nFunction\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 tm\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (get-date).ToLongTimeString()<\/span><\/p>\n

All I need is a way to grab the definition and write it to a file. I may even want to write several functions to a single file or append the function to an existing file. Thus was born my Export-Function function.<\/p>\n

\n
\n
Function Export-Function {<\/pre>\n
<\/p>\n
<\/p>\n
<#<\/span><\/pre>\n
<\/p>\n
.Synopsis<\/pre>\n
<\/p>\n
Export a PowerShell function<\/span> to a file.<\/pre>\n
<\/p>\n
.Description<\/pre>\n
<\/p>\n
Get a Windows PowerShell function<\/span> and export it to a file. You can export functions<\/pre>\n
<\/p>\n
individually, each to its own file, or you can export them to the same file using<\/pre>\n
<\/p>\n
-Append. By default<\/span> the filename will be a PowerShell script<\/span> file with the same<\/pre>\n
<\/p>\n
name as the function<\/span>, but you can specify an alternate name. See examples.<\/pre>\n
<\/p>\n
.Parameter Name<\/pre>\n
<\/p>\n
The name of the function<\/span> to export.<\/pre>\n
<\/p>\n
.Parameter Path<\/pre>\n
<\/p>\n
The folder for<\/span> the exported function<\/span>.<\/pre>\n
<\/p>\n
.Parameter Filename<\/pre>\n
<\/p>\n
The filename for<\/span> the exported function<\/span>. The default<\/span> is the function<\/span> name.<\/pre>\n
<\/p>\n
.Parameter Append<\/pre>\n
<\/p>\n
Write each function<\/span> to the same file.<\/pre>\n
<\/p>\n
.Example<\/pre>\n
<\/p>\n
PS C:\\> Export-Function \"MyFunction\"<\/span><\/pre>\n
<\/p>\n
<\/p>\n
This will export the MyFunction function<\/span> to a script<\/span> file called MyFunction.ps1.<\/pre>\n
<\/p>\n
.Example<\/pre>\n
<\/p>\n
PS C:\\> dir function<\/span>:*ISE* | Export-Function -path c:\\export -filename ISEFunctions.psm1 -append<\/pre>\n
<\/p>\n
<\/p>\n
Get all functions with ISE in<\/span> the name and export them to a module file C:\\export\\ISEFunctions.psm1<\/pre>\n
<\/p>\n
.Inputs<\/pre>\n
<\/p>\n
Strings for<\/span> function<\/span> names<\/pre>\n
<\/p>\n
.Outputs<\/pre>\n
<\/p>\n
None<\/pre>\n
<\/p>\n
.Link<\/pre>\n
<\/p>\n
About_Functions<\/pre>\n
<\/p>\n
Function (provider)<\/pre>\n
<\/p>\n
<\/p>\n
.Notes<\/pre>\n
<\/p>\n
VERSION: 1.0<\/pre>\n
<\/p>\n
<\/p>\n
This function<\/span> supports cmdlet binding so you can use -Verbose and -Whatif.<\/pre>\n
<\/p>\n
#><\/span><\/pre>\n
<\/p>\n
<\/p>\n
[cmdletbinding(SupportsShouldProcess=$True)]<\/pre>\n
<\/p>\n
<\/p>\n
Param(<\/pre>\n
<\/p>\n
[Parameter(Position=0,Mandatory=$true,ValueFromPipeline=$True,<\/pre>\n
<\/p>\n
HelpMessage=\"Enter the name of a current function to export\"<\/span>)]<\/pre>\n
<\/p>\n
[ValidateNotNullorEmpty()]<\/pre>\n
<\/p>\n
[string]$name,<\/pre>\n
<\/p>\n
<\/p>\n
[Parameter(Position=1,HelpMessage=\"Enter the folder to store the file.\"<\/span>)]<\/pre>\n
<\/p>\n
[ValidateScript({Test-path $_})]<\/pre>\n
<\/p>\n
[string]$path=\"C:\\scripts\"<\/span>,<\/pre>\n
<\/p>\n
<\/p>\n
[Parameter(Position=2,<\/pre>\n
<\/p>\n
HelpMessage=\"Enter the name of the file to create. The default is the function name.\"<\/span>)]<\/pre>\n
<\/p>\n
[ValidateNotNullorEmpty()]<\/pre>\n
<\/p>\n
[string]$filename=\"$name.ps1\"<\/span>,<\/pre>\n
<\/p>\n
<\/p>\n
[switch<\/span>]$append<\/pre>\n
<\/p>\n
)<\/pre>\n
<\/p>\n
<\/p>\n
    Begin {<\/pre>\n
<\/p>\n
        Write-Verbose \"Starting $($myinvocation.mycommand)\"<\/span><\/pre>\n
<\/p>\n
        #initialize a counter<\/span><\/pre>\n
<\/p>\n
        $i=0<\/pre>\n
<\/p>\n
    }<\/pre>\n
<\/p>\n
<\/p>\n
    Process {<\/pre>\n
<\/p>\n
        #verify function exists<\/span><\/pre>\n
<\/p>\n
        try {<\/pre>\n
<\/p>\n
            $myfunction=Get-Command -Name $name -ErrorAction \"Stop\"<\/span><\/pre>\n
<\/p>\n
        }<\/pre>\n
<\/p>\n
        catch {<\/pre>\n
<\/p>\n
            Write-Warning \"Failed to find function $name\"<\/span><\/pre>\n
<\/p>\n
            Return<\/pre>\n
<\/p>\n
        }<\/pre>\n
<\/p>\n
<\/p>\n
        #function found so continue<\/span><\/pre>\n
<\/p>\n
        if<\/span> ($myFunction) {<\/pre>\n
<\/p>\n
            #increment the counter by 1<\/span><\/pre>\n
<\/p>\n
            $i++<\/pre>\n
<\/p>\n
<\/p>\n
            #strip out illegal filename characters from function name<\/span><\/pre>\n
<\/p>\n
            [regex]$r=\"[:\/\\\\]\"<\/span><\/pre>\n
<\/p>\n
<\/p>\n
            if<\/span> ($r.matches($filename)[0]) {<\/pre>\n
<\/p>\n
                Write-Verbose \"Removing illegal filename characters from $filename\"<\/span><\/pre>\n
<\/p>\n
                $r.matches($filename) | foreach<\/span> {<\/pre>\n
<\/p>\n
                 $filename=$filename.replace($_.value,\"\"<\/span>)<\/pre>\n
<\/p>\n
                }<\/pre>\n
<\/p>\n
            } #if $r.matches<\/span><\/pre>\n
<\/p>\n
<\/p>\n
            $filepath=Join-Path -Path $path -ChildPath $filename<\/pre>\n
<\/p>\n
<\/p>\n
#this command needs to be left justifie so the final result is nicely<\/span><\/pre>\n
<\/p>\n
#formatted<\/span><\/pre>\n
<\/p>\n
$output=@(<\/pre>\n
<\/p>\n
\"{0} {1} {2} <\/span><\/pre>\n
<\/p>\n
 {3}<\/pre>\n
<\/p>\n
{4} #end function<\/pre>\n
<\/p>\n
<\/p>\n
###############################################################################<\/pre>\n
<\/p>\n
<\/p>\n
\" -f $myFunction.commandtype,$myFunction.name,\"{\"<\/span>,$myFunction.definition,\"}\"<\/span>)<\/pre>\n
<\/p>\n
<\/p>\n
          if<\/span> ($pscmdlet.ShouldProcess($name)) {<\/pre>\n
<\/p>\n
<\/p>\n
            if<\/span> ($append) {<\/pre>\n
<\/p>\n
                write-Verbose \"Exporting and appending to $filepath\"<\/span><\/pre>\n
<\/p>\n
            $output | Out-File -FilePath $filepath -Append<\/pre>\n
<\/p>\n
            }<\/pre>\n
<\/p>\n
            else<\/span> {<\/pre>\n
<\/p>\n
                Write-Verbose \"Exporting $name to $filepath\"<\/span><\/pre>\n
<\/p>\n
                $output | Out-File -FilePath $filepath<\/pre>\n
<\/p>\n
            }<\/pre>\n
<\/p>\n
           } #if shouldprocess<\/span><\/pre>\n
<\/p>\n
        } #if $myFunction<\/span><\/pre>\n
<\/p>\n
<\/p>\n
    } #process<\/span><\/pre>\n
<\/p>\n
<\/p>\n
    End {<\/pre>\n
<\/p>\n
        Write-Verbose \"Ending $($myinvocation.mycommand)\"<\/span><\/pre>\n
<\/p>\n
        Write-Host \"Exported $i functions\"<\/span> -ForegroundColor Green<\/pre>\n
<\/p>\n
    }<\/pre>\n
<\/p>\n
<\/p>\n
} #end function<\/span><\/pre>\n
<\/p>\n
<\/p>\n
Set-Alias -Name ef -Value Export-Function<\/pre>\n
<\/p>\n<\/div>\n<\/div>\n
This is an advanced PowerShell 2.0 function with complete help and examples. The script file that loads the function also defines an alias of ef<\/em>.<\/p>\n
By default Export-Function takes a function and creates a ps1 file using the function name as the file name. For example, to export my tm function<\/p>\n
PS C:\\> export-function tm<\/span><\/p>\n
This will create a file called tm.ps1 in C:\\Scripts. The function has a \u2013Path parameter to specify the default folder. I\u2019ve given it a default value of C:\\scripts. You might want to change the default value.<\/p>\n
Because a function might have characters in the name like :, which don\u2019t make good file names, I use a regular expression object to strip them out of the filename. If you specify a filename, then the function names will be left alone. At the end of each function is a separator line of ######################################. This comes in handy when exporting a number of functions to the same file.<\/p>\n
PS C:\\> dir function:*firefox*\u00a0 | export-function -path c:\\work -filename Firefox.psm1 \u2013append<\/span><\/p>\n
This will take all the functions in my current session with Firefox in the name and add them to a module file, c:\\work\\firefox.psm1. Very handy when you want to throw together a module. The function supports cmdlet binding so you can use \u2013Verbose and \u2013Whatif.<\/p>\n
PS C:\\> dir function:out* | export-function -whatif -verbose<\/span><\/span>
\nVERBOSE: Starting Export-Function<\/span>
\n <\/span>What if: Performing operation \"Export-Function\" on Target \"Out-Notepad\".<\/span><\/span>
\nWhat if: Performing operation \"Export-Function\" on Target \"Out-MSWord\".
\nWhat if: Performing operation \"Export-Function\" on Target \"Out-Clip\". <\/span><\/span>
\n <\/span>VERBOSE: Ending Export-Function<\/span> <\/span>
\nExported 0 functions<\/span><\/span><\/p>\n
As always, I hope you find this useful and will let me know what you think.<\/p>\n
\n
Download Export-Function.ps1<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
I love that you can do so much with PowerShell on the fly.\u00a0 For example, I don\u2019t need to launch a script editor to create a PowerShell function. I can do it right from the command prompt. PS C:\\> function tm {(get-date).ToLongTimeString()} PS C:\\> tm 12:41:27 PM As long as my PowerShell session is open,…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[75,8],"tags":[204,32,534,540],"class_list":["post-703","post","type-post","status-publish","format-standard","hentry","category-powershell-v2-0","category-scripting","tag-export","tag-functions","tag-powershell","tag-scripting"],"yoast_head":"\nExport-Function • The Lonely Administrator<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jdhitsolutions.com\/blog\/scripting\/703\/export-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Export-Function • The Lonely Administrator\" \/>\n<meta property=\"og:description\" content=\"I love that you can do so much with PowerShell on the fly.\u00a0 For example, I don\u2019t need to launch a script editor to create a PowerShell function. 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