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A quick PowerShell tip | Chris Miller's 3rd Blog

 2 years ago
source link: https://rajapet.com/2021/07/28/a-quick-powershell-tip/
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A quick PowerShell tip

I have a bunch of PowerShell functions that I stick in my $profile file. Simple stuff, things to make my day to day development work easier. With my sieve-like memory, I need a quick way to see the functions. So I wrote a script named “mine.ps1” and it’s basically a tiny help file.  It has stuff like this

write-host Commands -ForegroundColor White
write-host "get-guid-clipboard" -ForegroundColor Yellow
write-host "set-alias lsd get-by-date" -ForegroundColor Yellow
write-host "Set-Alias touch Set-FileTime" -ForegroundColor Yellow

In my $profile, I define those functions. They could (and should) be in a separate file, but I’m lazy. This is part of my PowerShell profile:

function Set-FileTime{
param(
[string[]]$paths,
[bool]$only_modification = $false,
[bool]$only_access = $false
)
begin {
function updateFileSystemInfo([System.IO.FileSystemInfo]$fsInfo) {
$datetime = get-date
if ( $only_access )
{
$fsInfo.LastAccessTime = $datetime
}
elseif ( $only_modification )
{
$fsInfo.LastWriteTime = $datetime
}
else
{
$fsInfo.CreationTime = $datetime
$fsInfo.LastWriteTime = $datetime
$fsInfo.LastAccessTime = $datetime
}
}
function touchExistingFile($arg) {
if ($arg -is [System.IO.FileSystemInfo]) {
updateFileSystemInfo($arg)
}
else {
$resolvedPaths = resolve-path $arg
foreach ($rpath in $resolvedPaths) {
if (test-path -type Container $rpath) {
$fsInfo = new-object System.IO.DirectoryInfo($rpath)
}
else {
$fsInfo = new-object System.IO.FileInfo($rpath)
}
updateFileSystemInfo($fsInfo)
}
}
}
function touchNewFile([string]$path) {
#$null > $path
Set-Content -Path $path -value $null;
}
}
process {
if ($_) {
if (test-path $_) {
touchExistingFile($_)
}
else {
touchNewFile($_)
}
}
}
end {
if ($paths) {
foreach ($path in $paths) {
if (test-path $path) {
touchExistingFile($path)
}
else {
touchNewFile($path)
}
}
}
}
}
function get-by-date {get-childitem | sort LastWriteTime }
function get-guid-clipboard { [guid]::NewGuid() | Set-Clipboard }
set-alias lsd get-by-date
Set-Alias touch Set-FileTime
Set-Alias -Name guidc -Value get-guid-clipboard -Description "Get a GUID and copy it to the clipboard"
function get-mine {. d:\\scripts\mine.ps1}
write-host "Type 'get-mine' for my local functions"
[System.Net.Dns]::GetHostByName($env:computerName).HostName.ToLower()

The touch functions came from the ss64.com site. I end by displaying the current machine name. When you remote into a box of boxes, it’s good to know where you currently are. Now when I fire up a new shell, I’ll see something like this:

PowerShell 7.1.3
Copyright (c) Microsoft Corporation.
Type 'help' to get help.
Type 'get-mine' for my local functions
uberbox
Loading personal and system profiles took 929ms.

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