How do you append to an already existing string?

In classic sh, you have to do something like:

s=test1s="${s}test2"

(there are lots of variations on that theme, like s="$s""test2")

In bash, you can use +=:

s=test1s+=test2

string bash shell string-concatenation

$ string="test"$ string="${string}test2"$ echo $stringtesttest2

string bash shell string-concatenation

#!/bin/bashmessage="some text"message="$message add some more"echo $message

some text add some more

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