Question

I am unable to make even the simplest export of variables, from within scripts, to work in my bash – what am I dooing wrong?

File test.sh :

#!/bin/bash
echo $ttt
ttt="fffalse"
export ttt
echo $ttt

bash test :

hpek@hpek:~/temp$ export ttt="tttrue"
hpek@hpek:~/temp$ ./test.sh 
tttrue
fffalse
hpek@hpek:~/temp$ ./test.sh 
tttrue
fffalse
hpek@hpek:~/temp$ 

Edit:

I now know from the answers, that this will not work. -but how can make a single variable remembered between processes? Do I need to store it in a file?

Answer 1

./test.sh is the same as bash test.sh

Each shell script running is, in effect, a subprocess (child process) of the parent shell.
And subprocess cannot export env-var to it’s parent.

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You can try this（run in the same environment）:

. test.sh