According to the Dodekalogue, a script is a string containing one or more commands. More generally, a script is a set of statements written in the language of an interpreter such as Tcl.
- Many ways to eval
- enumerates the ways to evaluate a string as a script
- split a script into its constituent commands
- scripted list
- use a script as a list
In Tcl, a script is a collection of 1 or more Tcl commands separated by semicolon or newline. A script can be handed to Tcl in various ways:
- invocation of an interpreter such as tclsh
- The name of the file can be passed as an argument
- the file name can be passed as an argument.
- 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.