Bash Manual section 6.7 Arrays should mention array append notation
$ array=( zero one two ) $ array+=( three four five ) $ declare -p array declare -a array='([0]="zero" [1]="one" [2]="two" [3]="three" [4]="four" [5]="five")' $ array=( [0]=zero [1]=one [2]=two ) $ array+=( [3]=three [4]=four [5]=five ) $ declare -p array declare -a array='([0]="zero" [1]="one" [2]="two" [3]="three" [4]="four" [5]="five")' $ declare -A assoc_array=( [zero]='0' [one]='1' [two]='2' ) $ assoc_array+=( [three]='3' [four]='4' [five]='5' ) $ declare -p assoc_array declare -A assoc_array='([four]="4" [one]="1" [five]="5" [zero]="0" [two]="2" [three]="3" )' Talking about the lines with "+=", obviously. I only learned I could do this when I found it in existing code. Regards, Zack
Re: Bash Manual section 6.7 Arrays should mention array append notation
On Tue, Mar 08, 2022 at 10:55:15AM -0500, Zachary Santer wrote: > Talking about the lines with "+=", obviously. I only learned I could > do this when I found it in existing code. It's mentioned in the PARAMETERS section: uated. When += is applied to an array variable using compound assign‐ ment (see Arrays below), the variable's value is not unset (as it is when using =), and new values are appended to the array beginning at one greater than the array's maximum index (for indexed arrays) or added as additional key-value pairs in an associative array. When ap‐ plied to a string-valued variable, value is expanded and appended to the variable's value. It's not mentioned under Arrays, though. Might not hurt to repeat it.
