why my code does not work?

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Originally Posted by FUTURE_EINSTEIN
Thanks a lot but why in some cases it perfectly accepts it with brackets for e.g for

Three words: ad-hoc parser.

It's a design flaw in CSH which means it will do radically different things for similar-seeming code and respond with baffling error messages to seemingly valid statements; or parses and executes completely invalid ones without complaint, but in potentially strange ways.

It's a design flaw, so happens in every implementation of csh, and can't be fixed.

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code(n) 							    [incr Tcl]								   code(n)

code - capture the namespace context for a code fragment SYNOPSIS
code ?-namespace name? command ?arg arg ...? DESCRIPTION
Creates a scoped value for the specified command and its associated arg arguments. A scoped value is a list with three elements: the "@scope" keyword, a namespace context, and a value string. For example, the command namespace foo { code puts "Hello World!" } produces the scoped value: @scope ::foo {puts {Hello World!}} Note that the code command captures the cur- rent namespace context. If the -namespace flag is specified, then the current context is ignored, and the name string is used as the namespace context. Extensions like Tk execute ordinary code fragments in the global namespace. A scoped value captures a code fragment together with its namespace context in a way that allows it to be executed properly later. It is needed, for example, to wrap up code fragments when a Tk widget is used within a namespace: namespace foo { private proc report {mesg} { puts "click: $mesg" } button .b1 -text "Push Me" -command [code report "Hello World!"] pack .b1 } The code fragment associated with button .b1 only makes sense in the context of namespace "foo". Furthermore, the "report" procedure is private, and can only be accessed within that namespace. The code command wraps up the code fragment in a way that allows it to be executed properly when the button is pressed. Also, note that the code command preserves the integrity of arguments on the command line. This makes it a natural replacement for the list command, which is often used to format Tcl code fragments. In other words, instead of using the list command like this: after 1000 [list puts "Hello $name!"] use the code command like this: after 1000 [code puts "Hello $name!"] This not only formats the command cor- rectly, but also captures its namespace context. Scoped commands can be invoked like ordinary code fragments, with or without the eval command. For example, the following statements work properly: set cmd {@scope ::foo .b1} $cmd configure -background red set opts {-bg blue -fg white} eval $cmd configure $opts Note that scoped commands by-pass the usual protection mechanisms; the command: @scope ::foo {report {Hello World!}} can be used to access the "foo::report" proc from any namespace context, even though it is private. KEYWORDS
scope, callback, namespace, public, protected, private itcl 3.0 code(n)

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