Fish (Unix shell): Difference between revisions

Revision as of 14:08, 11 June 2024

Revision as of 05:09, 1 July 2024

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=== No implicit subshell ===

Some language constructs, like [[pipeline (software)|pipelines]], [[subroutine|functions]] and [[control flow#Loops|loops]], have been implemented using so called [[SubshellChild process|subshells]] in other [[shell (computing)|shell]] languages. Subshells are child programs that run a few commands for the shell and then exit. This implementation detail typically has the side effect that any state changes made in the subshell, such as variable assignments, do not propagate to the main shell. Fish never forks off so-called subshells; all [[Shell_builtin|builtins]] are always fully functional.

<syntaxhighlight lang="fish">

# This will not work in many other shells, since the 'read' builtin