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Answer By default 'append' command is not available in iTest.   We could perform append in iTest by using Script actions.User should install TCL 8.4 or higher versions .   Example:   scriptSet     a 34 scriptEval   append a 56 scriptGet     n {$a} eval               puts $n   output:n=3456   Where "n" is a iTest variable and "a" is the tcl interpreter variable.