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CentOS 7.0 - man page for tcl_putenv (centos section 3)

Tcl_PutEnv(3)						      Tcl Library Procedures						     Tcl_PutEnv(3)

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NAME
Tcl_PutEnv - procedures to manipulate the environment
SYNOPSIS
#include <tcl.h> int Tcl_PutEnv(assignment)
ARGUMENTS
const char *assignment (in) Info about environment variable in the format "NAME=value". The assignment argument is in the system encoding. _________________________________________________________________
DESCRIPTION
Tcl_PutEnv sets an environment variable. The information is passed in a single string of the form "NAME=value". 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.
SEE ALSO
tclvars(n)
KEYWORDS
environment, variable Tcl 7.5 Tcl_PutEnv(3)