On 2/6/25 5:26 AM, Alexis Reynouard wrote:
Hello,This concern: https://www.gnu.org/software/bash/manual/bash.html#Shell-Parameter-Expansion In the bash documentation, section “shell parameter expansion,” in the paragraph “${parameter:-word},” the example given uses ${parameter-word} which is a Bourne Shell compatible expansion but behaves differently for defined but empty parameters. For greater clarity, shouldn't we write the following documentation (Please excuse the RST syntax):
This is the paragraph immediately before the part you quoted:
"When not performing substring expansion, using the form described below
(e.g., ‘:-’), Bash tests for a parameter that is unset or null. Omitting
the colon results in a test only for a parameter that is unset. Put another
way, if the colon is included, the operator tests for both parameter’s
existence and that its value is not null; if the colon is omitted, the
operator tests only for existence."
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
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