my customized powershell profile

profile.ps1

# http://joonro.github.io/blog/posts/powershell-customizations.html
Import-Module PSReadLine
# Oh-My-Posh https://github.com/pecigonzalo/Oh-My-Posh
Import-Module "Oh-My-Posh" -DisableNameChecking -NoClobber

Set-PSReadLineOption -HistoryNoDuplicates
Set-PSReadLineOption -HistorySearchCursorMovesToEnd
Set-PSReadLineOption -HistorySaveStyle SaveIncrementally
Set-PSReadLineOption -MaximumHistoryCount 4000
# history substring search
Set-PSReadlineKeyHandler -Key UpArrow -Function HistorySearchBackward
Set-PSReadlineKeyHandler -Key DownArrow -Function HistorySearchForward

# Tab completion
Set-PSReadlineKeyHandler -Chord 'Shift+Tab' -Function Complete
Set-PSReadlineKeyHandler -Key Tab -Function MenuComplete

function which($name) { Get-Command $name | Select-Object Definition }
function rm-rf($item) { Remove-Item $item -Recurse -Force }
function touch($file) { "" | Out-File $file -Encoding ASCII }
function admin() {Start-Process powershell -verb runas}
function grep {
    [cmdletbinding()]
    param (
        [Parameter(
                    Mandatory = $True,
                    ValueFromPipeline = $true)]
        $input,
        [Parameter(
                    Mandatory = $True,
                    ValueFromPipeline = $false,
            Position = 0)]
        [string] $SearchString
    )
    Process {
        $input | Out-String -Stream | Select-String -Pattern $SearchString
    }
}
function timestamp() {
    $unixEpochStart = new-object DateTime 1970,1,1,0,0,0,([DateTimeKind]::Utc)
    $timestamp = [int]([DateTime]::UtcNow - $unixEpochStart).TotalSeconds
    Write-Host $timestamp

    # set clipboard
    Write-Host "`nclipboard has set!`n" -ForegroundColor Yellow
    Set-Clipboard -Value $timestamp
}
function 2date($timestamp) {
    [DateTimeOffset]::FromUnixTimeSeconds($timestamp)
}
function Restart-PowerShell{
    Start-Process PowerShell # Launch PowerShell host in new window
    exit # Exit existing PowerShell host window
}
# Add any alias if you want, for ex. rps (rp already occupied by "Remove-ItemProperty”)
Set-Alias -Name rps -Value Restart-PowerShell