reading environment variables into gp?

["Prof. J. E. Cremona" <John.Cremona@nottingham.ac.uk>]

It would be very helpful if a gp script could read the value of a (unix)
environment variable, into a string or integer variable.

For example, something like

s=getenv("MY_ENV_VAR");

would result in s being a string variable.  The C function getenv() does
this, so perhaps it would be simply a question of install-ing it?

Motivation:  I can run a script simultaneously on N processors in a
cluster;  the job on the i'th processor sets the environment variable
SGE_TASK_ID to the integer value i.  Now, I would like each job to know
the value of i so that I can select a parameter from a list -- so that
all processors can use the same script instead of having to edit N
separate ones.

Apologies if this is already possible -- I did look in the manual and
also searched the list archives!

John

-- 
 Prof. J. E. Cremona             |
 University of Nottingham        | Tel.:  +44-115-9514920
 School of Mathematical Sciences | Fax:   +44-115-9514951
 University Park                 | Email: John.Cremona@nottingham.ac.uk
 Nottingham NG7 2RD, UK          |


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