PowerShell Error Handling

• Similar to most languages, PowerShell errors can be handled with try/catch blocks.

try { 0/0 }
catch {
  Write-Host "the error: $_" -fore cyan
}

• throw "error"
• catch [System.IO.FileNotFoundException] {}. Can chain several catch statements.
• PowerShell only handles terminating errors in try/catch blocks (as opposed to non-terminating)
• Traps can also be used to handle all terminating errors within a scope. Can be used to continue execution upon a terminating error.

function foo {
  trap {"error found"}
  0/0
  write-host "still here"
}

Related: two common parameters

• -ErrorAction [Continue [default] | Stop | SilentlyContinue | Inquire]. Stop is terminating. e.g. mv a b -ErrorAction Stop, mv c d -ea SilentlyContinue
• -ErrorVariable var_name - errors are assigned to this variable. Default: $error. Can also pass +var_name to append and not clear the variable. var_name is of type ArrayList. Default: $error. e.g. mv a a -ErrorVariable e, mv a a -ev e</i>

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