Manage Windows hosts file from command line

hosts.cmd

@echo off
powershell -f %~dp0hosts.ps1 %1 %2 %3

hosts.ps1

$file = 'C:\Windows\System32\drivers\etc\hosts'

function _ls () {
  get-content $file |
  % { $_.trim() } |
  where { $_ -ne '' } |
  where { !$_.startswith('#') } |
  % {
    ($_.split(' ') |
    % { $_.trim() } |
    where { $_ -ne '' } |
    select -first 2) `
    -join ' '
  }
}

function _add ($a, $b) {
  if (!$b) { add-content $file "127.0.0.1 $a" }
  else { add-content $file "$a $b" }
}

function _rm ($a, $b) {
  set-content $file (get-content $file | where {
    if (!$_.startswith('#')) {
      if ($a -and !$b) { $_ -notlike "*$a*" }
      if ($a -and $b) { $_ -notlike "*$a*$b*" }
    } else { $true }
  })
}

if ($args[0] -eq 'add') { _add $args[1] $args[2] }
if ($args[0] -eq 'rm') { _rm $args[1] $args[2] }
_ls

Example Usage:

λ hosts

λ hosts add dev
127.0.0.1 dev

λ hosts add local
127.0.0.1 dev
127.0.0.1 local

λ hosts rm local
127.0.0.1 dev

λ hosts
127.0.0.1 dev