script

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A '''script''' is a [data format] that contains a sequence of
[command%|%commands] separated by a semicolon or
newline.  More generally, a script is a set of statements written in the
[scripting language%|%language] of an [interpreter] such as [Tcl].



** See Also **

   [Dodekalogue]:   The rules of Tcl.

   [Many ways to eval]:   enumerates the ways to evaluate a string as a script 

   [cmdSplit%|%scriptSplit]:   split a script into its constituent commands

   [parsetcl]:   

   [scripted list]:   use a script as a list



** Description **

A script can be provided to Tcl in various ways:

   Invocation of an interpreter such as [tclsh]:   The name of the file can be passed as an argument.

   `[source]`:   the file name can be passed as an argument.

   `[eval]`:   arguments are concatenated and evaluated as a script.

   `[script substitution]`:   A script is embedded directly in another script. 


A script often provides a [library] for use by other scripts.

Tcl's sparse syntax makes it particularly convenient to embed code written in
another language directly into a Tcl script.  [SQL],
[Perl], [ksh], [awk], or even [C] code can then be handed off to to some
other interpreter for evaluation.  [SQL] is probably the most well-known
example of this.  When dynamically generating scripts for another language, it
is necessary to be aware of possible [Injection Attack%|%injection attacks].


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