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INTERESTING.md

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listing of interesting references

Variables internes bash: variables.c:545

backticks vs $(): https://www.baeldung.com/linux/command-substitution#syntax

APPLICATION USAGE (export utility) (useful for errexit)

Note that, unless X was previously marked readonly, the value of "$?" after:

export X=$(false)

will be 0 (because export successfully set X to the empty string) and that execution continues, even if set -e is in effect. In order to detect command substitution failures, a user must separate the assignment from the export, as in:

X=$(false) export X

Tests:

  • echo <<EOF |||

    • error then heredoc. what the fuck.

  • (echo abc && echo xyz) | (echo aaa && rev)

  • (echo abc && echo xyz) | (rev && cat)