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# Variables
# param defines -sha script argument and sets "" as default value

$args, $args[0] : args passed to script, by position

if ($sha -eq "") {
	$sha = (git rev-parse HEAD) | Out-String
	$sha = $sha.Trim()
}

# Variable expansion
Write-Host "sha: $sha" # writes the value of $sha
Write-Host 'sha: $sha is not expanded' # $sha is literal, not expanded inside ''
  • Write-Host
  • Out-String
  • Get-Variable : list all PowerShell variables
  • Get-ChildItem env: : list all env variables
  • gci env:PATH : get $PATH
  • Get-ChildItem -Recurse -Filter "*.chm" -EA SilentlyContinue | Select Length,Name : find all *.chm files
  • wget "http://blog.kowalczyk.info" -OutFile "index.html" : download url to index.html. wget is alias for Invoke-WebRequest
  • get-command code : equivalent of which in unix, find full path of vscode executable
# get PowerShell to inherit changes from .bat file:
cmd.exe /k "scripts\vc.bat & powershell"
# $path is dict Name/Value, where Name is "Path" and Value is value of PATH environment variable
$path = gci env:PATH
$dirs = $path.Value.Split(";")
(gci env:Path).Value.Split(";")
$line.Split("{.}")[1] : split $line by "." and get the second part
$env:PATH -split ';' : show components of $PATH
$line -Like "*.xml" : return true if matches regular expression
[IO.Path]::GetExtension($line) : call a function on $line
function isFileOnList($list, $file) {
	foreach ($item in $list) {
		$inList = $item.ToLower().EndsWith($file)
		if ($inList) {
			return $inList
		}
	}
	return False
}

$list = @("foo\bar.cpp", "foo.txt")
$in = isFileOnList($list, ".txt")
gci | Sort-Object Name -Descending : sort list of files by Name in descending order
# execute 'git rev-parse HEAD' and assign to a variable
$sha1 = (git rev-parse HEAD) | Out-String
$sha1 = $sha1.Replace([System.Environment]::NewLine,"")
# single-line comment
<#
multi-line
comment
#>
Set-StrictMode -Version Latest
$ErrorActionPreference = "Stop"
# call exitIfFailed after executing a command
function exitIfFailed { if ($LASTEXITCODE -ne 0) { exit } }
$DATE = [int][double]::Parse((Get-Date -UFormat %s))
$profile
Notes:
Execute .exe with spaces in path: & "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\editbin.exe" /stack:1048576 FindFilesGo.exe
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