A script 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.
- The rules of 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
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.
- 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.