Category:Tcl: Difference between revisions

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               '''|''' “''\\''” escapeSequence charSubsts''?''
               '''|''' ordinaryChar charSubsts''?''
+The syntax of the language is defined more exactly in the [http://www.tcl.tk/man/tcl8.5/TclCmd/Tcl.htm Tcl(n)] manual page.
+===Conceptual Command Syntax===
+Though formally not part of the language syntax, the syntactic style of the language's standard commands mostly follow a few basic syntactic principles:
+* Commands are variadic, and frequently accept arbitrary numbers of arguments.
+* Commands that take options will prefix the option name with a single ASCII hyphen, “-”, and if a value parameter to the option is required, that parameter will be in a subsequent argument to the option name.
+* Option names are not single character long strings after removing the hyphen (except in rare cases) and <code>getopt</code>-style argument combination is never supported.
+* Commands perform callbacks by evaluating a caller-provided Tcl script.
+** During-execution callback scripts are evaluated in the context of their caller.
+** After-execution callback scripts are evaluated in the global scope.
+* Commands cannot discover how their arguments were quoted.
 ==Language Semantics==
 ===Value Model===