Re: A defer command as a bash loadable builtin

[Léa Gris]

Le 25/06/2026 à 00:36, Gregory Heytings écrivait :
Is this better than
trap_append () { trap "$(printf "%s\n$1" "$(trap -P "$2")")" "$2"; }
trap_prepend () { trap "$(printf "$1\n%s" "$(trap -P "$2")")" "$2"; }

While effective, these functions rely on subshells for serialization and 
re-parsing, introducing unnecessary overhead and reduced readability due 
to the density required for quoting and string manipulation.

A native defer builtin provides a standard interface without these 
dependencies, eliminating subshells and "manual" trap string handling. 
As of now, defer exists as a loadable builtin as a thin-surface tech 
demonstrator, acknowledging the disadvantage of needing to compile and 
load the module. If adopted, integration as a core builtin would offer a 
robust and efficient standard for LIFO cleanup operations.

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Léa Gris