Variable substitution (what do you call / call this method)?

Question

Tell bash I have:

c=3

b3=4

instead:

echo $b3

what is the command to output "4"? I tried at the bottom but couldn't.

+3

beavis11111 Dec 30. 15 at 11:44

1 answer

user000001 · Accepted Answer · 2014-12-30T11:52:15+0000

You can use an indirect reference for this:

$ c=3
$ b3=4
$ d=b$c
$ echo "${!d}"
4

Although, in general, arrays should be used instead of indirect references whenever possible.