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− procedures to manipulate the environment
environment variable in the format The assignment
argument is in the system encoding.
sets an environment variable. The information is passed in a
single string of the form This procedure is intended to be a
stand-in for the UNIX putenv system call. All
Tcl-based applications using putenv should redefine
it to Tcl_PutEnv so that they will interface properly
to the Tcl runtime.