Thanks for your response. I think perhaps I have been too verbose in my explanation. What it boils down to is this.....
If I have the following variables set up for an iteration:
c=1
n=2
sl1=10
Is it possible (with eval or any other tool for that matter) to assign the value of sl1 to an (as yet undefined) variable called $di1sl2.
This would be easy enough if the name of $sl1 and the undefined variable did not change for every iteration.
So the way I see it happening (in psuedo-code) would be:
Then when you:
You should get:
10
Hopefully you can now see my issue, namely that the variable that contains "10" will be differently named for each iteration (it could be $sl1, $sl2 $sl3 etc). so this means that eval will need to deal with a "variable within a variable" - notice the two pairs of curly braces in the same variable in the example above.
Does this make it any clearer?
Many thanks....
Last edited by yonderboy; 04-19-2010 at 10:39 PM..
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Discussion started by: ASGR
8 Replies
LEARN ABOUT DEBIAN
envstore
ENVSTORE(1) BSD General Commands Manual ENVSTORE(1)NAME
envstore -- save and restore environment variables
SYNOPSIS
envstore command [args ...]
DESCRIPTION
envstore can save and restore environment variables, thus transferring them between different shells.
command must be one of
clear
Forget all stored variables
eval
Produce shell code for evaluation, restoring all saved variables
list
List saved variables in better readable format
save variable [value]
Save variable either with its current shell value or with value
rm variable
Remove variable from store
Note: Only the first character of command is checked, so envstore e instead of envstore eval, envstore c for envstore clear, etc., are also
valid.
ENVIRONMENT
ENVSTORE_FILE The file in which the environment parameters are stored, /tmp/envstore-EUID by default,
LIMITATIONS
Variable names or values must not contain null bytes or newlines.
Due to limitations imposed by most shells, it is not possible to save parameters containing more than one consecutive whitespace. envstore
will save and display them correctly, but unless you do IFS trickery, your shell will not be able to load them.
The current maximum length (in bytes) is 255 bytes for the variable name and 1023 bytes for its content.
AUTHOR
envstore was written by Daniel Friesel <derf@derf.homelinux.org>.
Original idea and script by Maximilian Gass <mxey@ghosthacking.net>.
SEE ALSO envify(1)BSD December 1, 2009 BSD