# Background jobs and pipeline stages run concurrently > Bashkit now runs cmd & jobs alongside the shell and streams pipeline stages into each other with SIGPIPE, adding jobs, wait -n, kill and related builtins. Source: Date: 2026-10-07 Products: Bashkit Category: Improvement Pull request: everruns/bashkit#2527 Pull request: everruns/bashkit#2541 `cmd &` now runs concurrently with the shell, so `sleep 1 & sleep 1 & wait` takes one second instead of two. New `jobs`, `disown`, `fg`, `bg`, `ps`, `pgrep` and `pkill` builtins, `wait -n`, `wait -p VAR` and jobspecs work, and `kill` ends jobs. Live jobs are capped by `ExecutionLimits::max_background_jobs`. Pipeline stages that run shell code, such as loops, groups and functions, now stream into each other through a pipe with backpressure. When a reader stops, the writer gets SIGPIPE and exits with 141, so `while :; do echo x; done | head -n 2` prints two lines as in bash. Both are on by default; `BashBuilder::concurrent_jobs(false)` turns them off. See the [compatibility scorecard](https://github.com/everruns/bashkit/blob/main/crates/bashkit/docs/compatibility.md), [#2527](https://github.com/everruns/bashkit/pull/2527) and [#2541](https://github.com/everruns/bashkit/pull/2541).