lastpipe
Lastpipe is a Bash shell option that controls where the final component of a pipeline is executed. In the standard pipeline model, each element runs in its own subshell, which means that changes to shell variables made by any but the last stage are not visible to the parent shell after the pipeline finishes. When the lastpipe option is enabled, the last command in a pipeline is executed in the current shell instead of a subshell, allowing variable assignments and other side effects to persist beyond the pipeline.
Lastpipe is managed with the built-in shopt command. Enable it with shopt -s lastpipe and disable it
Without lastpipe, a common pattern to accumulate a value in a pipeline may fail to update the
Limitations and considerations
While lastpipe can simplify certain data-processing patterns, it changes the expected isolation between pipeline stages. Scripts