bash : Bad Substitution on array variable

Question

Below is my extract of the failure part:

if [[ -n "${war_to_be_deployed-}" ]] ; then
    [[ "${#runtime_args[@]-}" == "${#expected_runtime_args[@]-}" ]]             || _fatal "Failed runtime_args"     
    for ((i=0 ; i<${#runtime_args[@]-} ; ++i)); do

throws below error on bash GNU bash, version 4.4.20(1)-release (x86_64-pc-linux-gnu). What is it that I'm doing incorrect here ? thank you.

${#runtime_args[@]-}: bad substitution

Why is there a - in ${#runtime_args[@]-} and ${#expected_runtime_args[@]-}? It is not needed — Fravadona
– Fravadona, Commented Nov 23, 2021 at 8:20

user9706 · Accepted Answer · 2021-11-23 07:07:51Z

1

${#runtime_args[@]} is number of elements in the array. The trialing - is what triggers the error. Is this script generated? It looks like a syntax error to me.

answered Nov 23, 2021 at 7:07

user9706

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1 Comment

Chel MS Over a year ago

No, its not generated, it runs fine on previous Ubuntu version, version being Ubuntu 14

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