in_progress
true

Process Model

Related: Interpreter State. These two docs are the missing documentation for shell!

Constructs

Pipelines

shopt -s lastpipe

Functions Can Be Transparently Put in Pipelines

Explicit Subshells are Rarely Needed

prefer pushd / popd, or cd { } in Oil.

Redirects

Other

xargs, xargs -P
find -exec

Builtins

wait

fg

bg

trap