powershell:qnd:file_operations [Whizzbang Tech Stuff]

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====== File Operations ======

====== Path References ======
<code powershell>
$env:userprofile\Desktop

$Home\Desktop

~\Desktop
</code>

=== User Split-Path to get folder name ===
<code powershell>
cd $(Split-Path $PROFILE)
</code>

====== Common Commands By Example ======
=== List Items with Filter/Search for files with matching string in name ===
Example of finding a file somewhere in the filesystem and outputting the full path and filename.
<code powershell>
Get-ChildItem -Recurse -Filter "csc.exe" | foreach {$_.Fullname}
</code>

Use a regex with ''-Match'' operator for more advanced filtering.
<code powershell>
gci -Recurse | where {$_.Name -Match "^csc.*"} | foreach {$_.Fullname}
</code>

=== List Items ===
<code powershell>
$exclude = @("*.log", "*.tmp", "log*.txt")
$files = ls -Recurse -Exclude $exclude
Compress-Archive -Path $files -DestinationPath $home\desktop\webagent.zip
</code>

<code powershell>
$base_path = "$home\downloads"
$exclude_dir_files = @("$base_path\tmp\*",
  "$base_path\log\*",
  "*.tmp",
  "*.log"
)

ls -Recurse -Exclude $exclude_dir
</code>

Example of using ''-Exclude'' and additional regex filtering with ''-notmatch'' operator. This is useful for excluding folders.
<code powershell>
$exclude = @("*.log", "*.tmp", "log*.txt*")
$files = ls -Recurse -Exclude $exclude
$files = $files | where {$_.FullName -notmatch ".*\\logs"}
Compress-Archive -Path $files -DestinationPath $home\desktop\webagent.zip
</code>

  * Use the ''-File'' or ''-Directory'' option of ''Get-ChildItem'' to list on those items.
<code powershell>
$exclude = @("*.log", "*.tmp", "log*.txt*")
$files = ls -File -Recurse -Exclude $exclude
Compress-Archive -Path $files -DestinationPath $home\desktop\webagent.zip
</code>

=== Search through files for string/grep ===
Example
<code powershell>
Get-ChildItem -Recurse *.config | Select-String "foo" -List | Select Path
</code>

=== Create File ===
<code powershell>
New-Item -force $env:temp\foo\foo.txt
</code>

=== Zip Files ===
Example
<code powershell> 
Compress-Archive -Path .\* -DestinationPath $env:userprofile\desktop\webapp1.zip
</code>

Example
<code powershell>
$files = ls -Path .\* -Exclude @("*.tmp", "*.log")
Compress-Archive -Path $files -DestinationPath $env:userprofile\desktop\webapp1.zip
</code>

<code powershell>
$files = ls -Recurse | Where-Object {$_.FullName -notlike "*log*"}
Compress-Archive -Path $file -DestinationPath $env:userprofile\desktop\webapp1.zip
</code>

List contents of archive
<code powershell> 
$archive = [System.IO.Compression.ZipFile]::OpenRead("$env:userprofile\downloads\archive.zip")

$archive.Entries | Select-Object -Property FullName
</code>

Unzip zip archives contained in another zip archive.
<code powershell>
Expand-Archive -DestinationPath .\zips '.\all_reports.zip'
ls .\zips\ | % {Expand-Archive -DestinationPath $env:temp $_.FullName}
</code>

=== Create a folder with name following scheme ===
<code powershell>
$suffix = 1

while ((Test-Path "$env:temp\mg-$suffix") -ne $false) {
    $suffix += 1
}

mkdir "$env:temp\mg-$suffix"
</code>

<code powershell>
$names = @("alpha", "beta", "gamma")

$name = 0

while ($name -lt $names.Count) {
    if ((Test-Path "$env:temp\$names[$name]") -eq $false) {
        break
    }

    $name += 1
}

if ($name -eq $names.Count) {
    $name = 0   
}

mkdir "$env:temp\$($names[$name])"
</code>