On 12/14/20 4:45 AM, Oğuz wrote:
$ Y+='($foo 3)'
$ declare -p Y
declare -A Y=([0]="(\$foo 3)" ["1 2"]="3" )
Where did the 0 come from?
That's a scalar assignment. You quoted the parens so it can't be a compound
assignment. Since the variable is an array, and an assignment was performed
without a subscript, you get the default subscript of "0".
The difference between this and quoting the rhs of an assignment when you
use `declare' is that `declare' is a builtin, and so its arguments undergo
a round of expansion before `declare' sees them. That's the fundamental
difference between assignment statements and arguments to declaration
commands that look like assignment statements.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU [email protected] http://tiswww.cwru.edu/~chet/
