What are environment variables "BASH_FUNC_somename%%"?

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  • I see environment variables similar to "BASH_FUNC_somename%%", what are they and what are they for?

    > env | grep '%%'
    BASH_FUNC_which%%=() {  ( alias;
    BASH_FUNC_module%%=() {  _module_raw "$@" 2>&1


  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

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