Append a line while keeping earlier content.
PowerShell: Add-Content appends using an explicitly selected encoding.
$ErrorActionPreference = 'Stop'
Set-StrictMode -Version Latest
Add-Content -LiteralPath 'events.txt' -Value 'second' -Encoding utf8
Get-Content -LiteralPath 'events.txt'Expected output EXAMPLE
first second
Details
Requires PowerShell 7. Save as snippet.ps1 and run pwsh -NoProfile -File snippet.ps1. Tested on Linux; these examples use portable paths and cmdlets. Add-Content appends using an explicitly selected encoding.
Tested on Ubuntu 24.04.5 LTS · · PowerShell 7.6.6 · powershell 7.6.6-1.deb
Test inputs, results and environment
The exact published code ran in a dedicated Linux test container with prepared inputs. Snippet process uid 65534 with a read-only root filesystem and temporary working files. Networking disabled. Fixtures and output records are isolated from the application database. Testing covers this example and its stated checks, not every input, operating system, or runtime version. The Linux container shares its host's kernel; this is not a native Windows test.
- Architecture / host kernel
- x86_64 / 6.18.54.1-microsoft-standard-WSL2
- Snippet identity / locale
- uid=65534, gid=65534 (unprivileged process) / C.UTF-8
- Interpreter invocation
pwsh -NoLogo -NoProfile -NonInteractive -File snippet.ps1- Container image ID
sha256:ec91410a8f6ec3e985830b5e3a0560306d36f8c1c5ccd91a6699abe707123fa3- Code SHA-256
ad1078c5e210b9b6cb7c71302afa1bf303b470db0e720d8994535efa67b255ec- Dependencies
- powershell 7.6.6-1.deb
Test input setup
These are the prepared inputs used by the test harness. See Details above for the prerequisites and how to run this example.
printf 'first\n' > events.txt
Observed standard output
first second
Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.
Additional assertions that passed
Checks recorded by the test harness. Where Python assertions are shown, browser cases use Playwright and simulator cases may inspect pin transitions: result.stdout is captured output, work is the temporary directory, and Path is pathlib.Path. The harness also imports json and csv.
assert Path('events.txt').read_text() == 'first\nsecond\n'