Bash indirect array addressing?
Suppose I have some bash arrays:
A1=(apple trees)
A2=(building blocks)
A3=(color television)
And index J=2, how to get the array contents of A2?
I've already found a resolution, this can be done by:
$ Aref=A$J
$ echo ${!Aref}
building
$ Aref=A$J[1]
$ echo ${!Aref}
blocks
$ Aref=A$J[@]
$ echo "${!Aref}"
building blocks
It’s worth to note, that even an index will be substituted at time the variable is evaluated:
$ A2=(building blocks)
$ Aref=A2[index]
$ index=1
$ echo "${!Aref}"
blocks