Version 17 of script

Updated 2018-04-20 09:23:09 by pooryorick

A script is a contains commands separated by a semicolon or newline. More generally, a script is a set of statements written in the 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

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 attacks.

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