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A bash script is running as I defined it in Startup Applications. It is possible to display on terminal a variable used in that script? If yes, how?

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You don't even tell us what kind of script? bash, Perl, Python? echo "$var"? – Hauke Laging Jun 8 '13 at 14:23
    
@HaukeLaging It's about a script bash. I tagged this thing. – Radu Rădeanu Jun 8 '13 at 14:42
    
It is rather unusual to use the tags for providing essential information rather than for a summary of the question's main topics... – Hauke Laging Jun 8 '13 at 14:52
up vote 2 down vote accepted

The quick answer (assuming this is a bash script as tagged) is no, variables are not shared between separate shell instances. The only way I know of to access a variable from a script started in a different shell is to have the script write the variable to a file and then access that file.

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Have a look at /proc/$PID/environ and be happy. (Yes, that works for exported variables only.) – Hauke Laging Jun 8 '13 at 14:55
    
@HaukeLaging doesn't seem to work. I have a script running that contains export FOO=bar and cannot see FOO in /proc/$PID/environ` (I tried both the script's PID and the PID of the shell the script is running in). – terdon♦ Jun 8 '13 at 15:08
    
Sorry, then I had a misunderstanding about how export works. Seems it becomes active after a fork / before an execve only. – Hauke Laging Jun 8 '13 at 15:13

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