Re: TCL Setting variables in module files

[Leo B. <le...@le...>]

Ric Rocheleau wrote:

> Hello All
> 
> I am trying to set some variables in a module file to execute
> some setup scripts.
> 
> In /bin/sh, I can do variable_name=`env | grep SHELL` 
> then feed that output into an if/then statement
> 	
> What is the syntax in TCL ?

Hello, Ric.

In Tcl, you use $env to pick up environment variables
as so:

set variable_name $env(SHELL)

Note that you don't use the $ if you're checking for
existince with "info exists".  An example of usage
in this context would be

if [info exists env(SHELL)] {
   set variable_name $env(SHELL)
}

The above can be tested using tclsh; it's all plain
Tcl code.

And as for a "sh" script, I've always used the $ notation
to access shell/env vars.  To capture the value of the
SHELL variable, you can just do

variable_name=${SHELL}

(brackets optional) which avoids calling the external "env"
program.

Hope this helps,

- Leo Butler