How do I print TCL environment variable in my bash script

Question

TCL script

set ::env(foo) "bar"

bash script

echo ${env(foo)}
echo $foo

I am able to print the environment variable in the TCL script but for some reason I can't print the environment variable in my bash script. What am I doing wrong?

Answer 1

If your bash script contains something like this (let's call it showenv )

#! /bin/bash

echo $foo

and your tcl

#! /usr/bin/tclsh

set ::env(foo) bar

exec ./showenv >>& /dev/tty

then, showenv will show

bar

that is, the tcl script sets the environment for its children processes.