[vox-tech] Bash script to setup environment variables

[Ted Deppner]

On Fri, Dec 28, 2001 at 08:50:03AM -0800, Ricardo Anguiano wrote:
> How about using signals?  The sub-process can handle the signal by
> parsing a variable file you designate at compile time.  The signal
> handler can then redefine environment variables with setenv(3).

Excellent idea!  In bash, you can use trap to do this:

ted@dondra:~$ trap "echo test; echo test2" ALRM
ted@dondra:~$ kill -ALRM $$
test
test2

ted@dondra:~$ trap "a=1" USR1
ted@dondra:~$ trap "a=2" USR2
ted@dondra:~$ echo $a

ted@dondra:~$ kill -USR1 $$
ted@dondra:~$ echo $a
1
ted@dondra:~$ kill -USR2 $$
ted@dondra:~$ echo $a
2

-- 
Ted Deppner
http://www.psyber.com/~ted/