sh

Summary

Item	Value
API name	sh
source OCI image	alpine:3.22
per-job resource ceiling	1 vCPU, 256 MiB

The vCPU and RAM ceiling exists to prevent abuse; libkrun memory is elastic and the host only pays for what the guest touches.

Warmup

None: the base image already ships sh.

How the code is executed

The main file (the first in files) is executed with sh <file> — the Alpine image's shell (BusyBox). For Bash-specific features (arrays, [[ ]]), use the bash language. Everything runs in a directory under /tmp (tmpfs), in a fresh VM destroyed at the end of the job, with no network.

Building the image

rc image build --stack sh

Example

curl -s http://127.0.0.1:8080/api/v1/run \
  -H 'Content-Type: application/json' \
  -d '{
    "language": "sh",
    "files": [
      {"name": "main.sh", "content": "read n\necho $((n * 2))\n"}
    ],
    "stdin": "21"
  }'

Expected stdout: 42.