exists_and_not_null

one of the documented procedures in this installation of the ACS
Usage:
exists_and_not_null   varname
What it does:
Returns 1 if the variable name exists in the caller's environment and is not the empty string.
Defined in: /web/philip/packages/acs-core/utilities-procs.tcl

Source code: 


    upvar 1 $varname var 
    return [expr { [info exists var] && ![empty_string_p $var] }]
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