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Re: Two states of empty arrays
From: |
Chet Ramey |
Subject: |
Re: Two states of empty arrays |
Date: |
Thu, 12 Dec 2019 14:13:12 -0500 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 |
On 12/12/19 12:08 PM, Léa Gris wrote:
Hello,
Depending on how an empty array is declared, it is not stored with the
same state.
# Empty array declared without parenthesis
unset myArr
declare -a myArr
typeset -p myArr
echo "${#myArr[@]}"
This is an unset variable with the array attribute; you have not assigned a
value.
# Empty array declared without parenthesis
unset myArr
declare -a myArr=()
This is an empty array variable; you have assigned a value.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/