Eval Command In Tcl - davidorlic.com

Like many commands in Tcl, eval can lead to double substitution. Sometimes this is desirable, and sometimes it isn't. The skilled Tcl programmer knows how to wield double substitution. Historically, eval was often used with exec, to flatten lists, allowing a single list to provide multiple arguments to a command. eval is a feature of most interpreted languages TCL, python, ruby., not only shells. It's used to evaluate code dynamically. In shells, it's implemented as a shell builtin command. Basically, eval takes a string as argument and evaluates/interprets the code in it. Tcl Built-In Commands NAME eval - Evaluate a Tcl script SYNOPSIS. Eval takes one or more arguments, which together comprise a Tcl script containing one or more commands. Eval concatenates all its arguments in the same fashion as the concat command, passes the concatenated string to the Tcl interpreter recursively. Starting with Tcl 8.5 current is 8.6.8, the expansion operatorwhich breaks a list into its component words was added, and eval is rarely needed except when evaluating scripts and script fragments. With older versions of Tcl, eval is used instead of the expansion operator. With the use of the expansion operator, 2 would become. subst or eval command is not working in my case. % proc sum a breturn [expr. TCL subst or eval command is not working in my case. Ask Question Asked 6 years, 2 months ago. If you call a command, Tcl will replace the variables before the actuall call is made.

Often, it is useful to store a fragment of a script in a variable and execute it later on with extra values appended. This technique is used in a number of places throughout the Tcl core e.g. in fcopy, lsort and trace command callbacks. This example shows how to do this using core Tcl commands. eval:调用一个TCL脚本语法:eval arg ?arg?eval带一个或多个变元,可以由一个或多个命令组成,eval采用concat命令的风格连接所有变元,执行命令并且返回执行结果。即如果是一. Tcl - Namespaces - Namespace is a container for set of identifiers that is used to group variables and procedures. Namespaces are available from Tcl version 8.0. Before the introd. Quoting Issues and Eval 10 This chapter describes explicit calls to the interpreter with the eval command. An extra round of substitutions is performed that results in some useful effects. The chapter describes the quoting problems with eval and the ways to avoid them. The uplevel command evaluates commands in a different scope. Using the eval command The eval command accepts one or more arguments that, when combined, create a Tcl script. When invoked, it passes the stored script to the command interpreter- Selection from Tcl/Tk 8.5 Programming Cookbook [Book].

Tcl_VarEval takes any number of string arguments of any length, concatenates them into a single string, then calls Tcl_Eval to execute that string as a Tcl command. It returns the result of the command and also modifies interp->result in the same way as Tcl_Eval.

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