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$IP_URL = "127.0.0.1 www.bing.com"
if ((Get-Content $env:windir\System32\drivers\etc\hosts | ?{ $_ -match "/s$IP_URL" }) -eq $null)
{
"`n$IP_URL" | Out-File "$env:windir\System32\drivers\etc\hosts" -Append -enc ascii
echo "已添加！"
}
else
{
echo "已存在"
}

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$IP_URL = "127.0.0.1 www.bing.com"
if ((Get-Content $env:windir\System32\drivers\etc\hosts | ?{ $_ -match "$($IP_URL -replace '\s+','\s+')" }) -eq $null)
{
"$IP_URL" | ac "$env:windir\System32\drivers\etc\hosts"
echo "已添加！"
}
else
{
echo "已存在"
}

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$IP_URL = @(
"127.0.0.1 www.bing.com"
"127.0.0.1 www.sina.com"
)
$IP_URL -notmatch "$((Get-Content $env:windir\System32\drivers\etc\hosts | ?{ $_ -match "$($IP_URL -join '|')"}) -join '|')"|ac "$env:windir\System32\drivers\etc\hosts"

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# Uncomment lines with localhost on them:
$hostsPath = "$env:windir\System32\drivers\etc\hosts"
$hosts = get-content $hostsPath
$hosts = $hosts | Foreach {if ($_ -match '^\s*#\s*(.*?\d{1,3}.*?localhost.*)')
{$matches[1]} else {$_}}
$hosts | Out-File $hostsPath -enc ascii
# Comment lines with localhost on them:
$hosts = get-content $hostsPath
$hosts | Foreach {if ($_ -match '^\s*([^#].*?\d{1,3}.*?localhost.*)')
{"# " + $matches[1]} else {$_}} |
Out-File $hostsPath -enc ascii

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function setHostEntries([hashtable] $entries) {
$hostsFile = "$env:windir\System32\drivers\etc\hosts"
$newLines = @()
$c = Get-Content -Path $hostsFile
foreach ($line in $c) {
$bits = [regex]::Split($line, "\s+")
if ($bits.count -eq 2) {
$match = $NULL
ForEach($entry in $entries.GetEnumerator()) {
if($bits[1] -eq $entry.Key) {
$newLines += ($entry.Value + ' ' + $entry.Key)
Write-Host Replacing HOSTS entry for $entry.Key
$match = $entry.Key
break
}
}
if($match -eq $NULL) {
$newLines += $line
} else {
$entries.Remove($match)
}
} else {
$newLines += $line
}
}
foreach($entry in $entries.GetEnumerator()) {
Write-Host Adding HOSTS entry for $entry.Key
$newLines += $entry.Value + ' ' + $entry.Key
}
Write-Host Saving $hostsFile
Clear-Content $hostsFile
foreach ($line in $newLines) {
$line | Out-File -encoding ASCII -append $hostsFile
}
}
$entries = @{
'aaa.foo.local' = "127.0.0.1"
'bbb.foo.local' = "127.0.0.1"
'ccc.foo.local' = "127.0.0.1"
};
setHostEntries($entries)

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$domainName = "www.abc.com"
$rplaceStr = ""
$rHost = "C:\Windows\System32\drivers\etc\hosts"
$items = Get-Content $rHost | Select-String $domainName
Write-host $items
foreach( $item in $items)
{
(Get-Content $rHost) -replace $item, $rplaceStr| Set-Content $rHost
}

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$Hosts = "$env:windir\System32\drivers\etc\hosts"
$urls = @(
"www.baidu.com"
"www.bing.com"
) |
foreach{
if ((gc $Hosts | Select-String $_) -eq $null)
{
ac $hosts "127.0.0.1 $_"
}
}

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$IP_URL = @(
"127.0.0.1 www.bing.com"
"127.0.0.1 www.sina.com"
)
$a=(Get-Content "$env:windir\System32\drivers\etc\hosts" | ?{ $_ -match "$($IP_URL -join '|')"}) -join '|'
if ($a -eq '')
{
$IP_URL | ac "$env:windir\System32\drivers\etc\hosts"
echo "已添加！"
}
else
{
$IP_URL -notmatch "$a" | ac "$env:windir\System32\drivers\etc\hosts"
echo "已存在"
}

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$Hosts = "$env:windir\System32\drivers\etc\hosts"
$a=gc $Hosts
$urls = @(
"www.baidu.com"
"www.bing.com"
) |
foreach{
if($a[-1] -ne ''){ac $hosts ''}elseif ((gc $Hosts | Select-String $_) -eq $null)
{
ac $hosts "127.0.0.1 $_"
}
}

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$Hosts = "$env:windir\System32\drivers\etc\hosts"
$a = gc $Hosts
if ($a[-1] -ne '') { ac $hosts '' }
$urls = @(
"www.baidu.com"
"www.bing.com"
) |
foreach{
if ((gc $Hosts | Select-String $_) -eq $null)
{
ac $hosts "127.0.0.1 $_"
}
}

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Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
$hostsfilelocation = "$env:windir\System32\drivers\etc\hosts"
$readhostsfile = Get-Content $hostsfilelocation
$form = New-Object System.Windows.Forms.Form
$form.Text = 'Update HOSTS File'
$form.Size = New-Object System.Drawing.Size(300, 200)
$form.StartPosition = 'CenterScreen'
$AddHosts = New-Object System.Windows.Forms.Button
$AddHosts.Location = New-Object System.Drawing.Point(55, 120)
$AddHosts.Size = New-Object System.Drawing.Size(90, 25)
$AddHosts.Text = 'Add Record'
$AddHosts.DialogResult = [System.Windows.Forms.DialogResult]::OK
$form.AcceptButton = $AddHosts
$form.Controls.Add($AddHosts)
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Point(170, 120)
$CancelButton.Size = New-Object System.Drawing.Size(75, 25)
$CancelButton.Text = 'Cancel'
$CancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
$form.CancelButton = $CancelButton
$form.Controls.Add($CancelButton)
$Hostslabel = New-Object System.Windows.Forms.Label
$Hostslabel.Location = New-Object System.Drawing.Point(10, 20)
$Hostslabel.Size = New-Object System.Drawing.Size(280, 20)
$Hostslabel.Text = 'Enter New HOSTNAME/FQDN:'
$form.Controls.Add($Hostslabel)
$HoststextBox = New-Object System.Windows.Forms.TextBox
$HoststextBox.Location = New-Object System.Drawing.Point(10, 40)
$HoststextBox.Size = New-Object System.Drawing.Size(260, 20)
$form.Controls.Add($HoststextBox)
$IPlabel = New-Object System.Windows.Forms.Label
$IPlabel.Location = New-Object System.Drawing.Point(10, 60)
$IPlabel.Size = New-Object System.Drawing.Size(280, 20)
$IPlabel.Text = 'Enter IP:'
$form.Controls.Add($IPlabel)
$IPtextBox = New-Object System.Windows.Forms.TextBox
$IPtextBox.Location = New-Object System.Drawing.Point(10, 80)
$IPtextBox.Size = New-Object System.Drawing.Size(260, 20)
$form.Controls.Add($IPtextBox)
$form.Topmost = $true
$form.Add_Shown({ ($HoststextBox, $IPtextbox).Select() })
$result = $form.ShowDialog()
if ($result -eq [System.Windows.Forms.DialogResult]::OK)
{
$inputhosts = $HoststextBox.Text
$inputip = $IPtextBox.Text
$newrecord = "$inputip $inputhosts"
Add-Content -Path $hostsfilelocation -Value $newrecord
}

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