info(n) Tcl Built-In Commands info(n)
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NAME
info - Return information about the state of the Tcl interpreter
SYNOPSIS
info option ?arg arg ...?
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DESCRIPTION
This command provides information about various internals of the Tcl interpreter. The legal option's
(which may be abbreviated) are:
info args procname
Returns a list containing the names of the arguments to procedure procname, in order. Proc-name Procname
name must be the name of a Tcl command procedure.
info body procname
Returns the body of procedure procname. Procname must be the name of a Tcl command procedure.
info cmdcount
Returns a count of the total number of commands that have been invoked in this interpreter.
info commands ?pattern?
If pattern isn't specified, returns a list of names of all the Tcl commands in the current
namespace, including both the built-in commands written in C and the command procedures
defined using the proc command. If pattern is specified, only those names matching pattern
are returned. Matching is determined using the same rules as for string match. pattern can
be a qualified name like Foo::print*. That is, it may specify a particular namespace using a
sequence of namespace names separated by ::s, and may have pattern matching special characters
at the end to specify a set of commands in that namespace. If pattern is a qualified name,
the resulting list of command names has each one qualified with the name of the specified
namespace.
info complete command
Returns 1 if command is a complete Tcl command in the sense of having no unclosed quotes,
braces, brackets or array element names, If the command doesn't appear to be complete then 0
is returned. This command is typically used in line-oriented input environments to allow
users to type in commands that span multiple lines; if the command isn't complete, the script
can delay evaluating it until additional lines have been typed to complete the command.
info default procname arg varname
Procname must be the name of a Tcl command procedure and arg must be the name of an argument
to that procedure. If arg doesn't have a default value then the command returns 0. Otherwise
it returns 1 and places the default value of arg into variable varname.
info exists varName
Returns 1 if the variable named varName exists in the current context (either as a global or
local variable) and has been defined by being given a value, returns 0 otherwise. |
info functions ?pat- |
tern? | |
If pattern isn't specified, returns a list of all the math functions currently defined. If |
pattern is specified, only those functions whose name matches pattern are returned. Matching |
is determined using the same rules as for string match.
info globals ?pattern?
If pattern isn't specified, returns a list of all the names of currently-defined global vari-ables. variables.
ables. Global variables are variables in the global namespace. If pattern is specified, only
those names matching pattern are returned. Matching is determined using the same rules as for
string match.
info hostname
Returns the name of the computer on which this invocation is being executed. Note that this |
name is not guaranteed to be the fully qualified domain name of the host. Where machines have |
several different names (as is common on systems with both TCP/IP (DNS) and NetBIOS-based net- |
working installed,) it is the name that is suitable for TCP/IP networking that is returned.
info level ?number?
If number is not specified, this command returns a number giving the stack level of the invok-ing invoking
ing procedure, or 0 if the command is invoked at top-level. If number is specified, then the
result is a list consisting of the name and arguments for the procedure call at level number
on the stack. If number is positive then it selects a particular stack level (1 refers to the
top-most active procedure, 2 to the procedure it called, and so on); otherwise it gives a
level relative to the current level (0 refers to the current procedure, -1 to its caller, and
so on). See the uplevel command for more information on what stack levels mean.
info library
Returns the name of the library directory in which standard Tcl scripts are stored. This is
actually the value of the tcl_library variable and may be changed by setting tcl_library. See
the tclvars manual entry for more information.
info loaded ?interp?
Returns a list describing all of the packages that have been loaded into interp with the load
command. Each list element is a sub-list with two elements consisting of the name of the file
from which the package was loaded and the name of the package. For statically-loaded packages
the file name will be an empty string. If interp is omitted then information is returned for
all packages loaded in any interpreter in the process. To get a list of just the packages in
the current interpreter, specify an empty string for the interp argument.
info locals ?pattern?
If pattern isn't specified, returns a list of all the names of currently-defined local vari-ables, variables,
ables, including arguments to the current procedure, if any. Variables defined with the
global, upvar and variable commands will not be returned. If pattern is specified, only
those names matching pattern are returned. Matching is determined using the same rules as for
string match.
info nameofexecutable
Returns the full path name of the binary file from which the application was invoked. If Tcl
was unable to identify the file, then an empty string is returned.
info patchlevel
Returns the value of the global variable tcl_patchLevel; see the tclvars manual entry for more
information.
info procs ?pattern?
If pattern isn't specified, returns a list of all the names of Tcl command procedures in the
current namespace. If pattern is specified, only those procedure names in the current names-pace namespace
pace matching pattern are returned. Matching is determined using the same rules as for string
match.
info script ?filename?
If a Tcl script file is currently being evaluated (i.e. there is a call to Tcl_EvalFile active
or there is an active invocation of the source command), then this command returns the name of
the innermost file being processed. If filename is specified, then the return value of this
command will be modified for the duration of the active invocation to return that name. This
is useful in virtual file system applications. Otherwise the command returns an empty string.
info sharedlibextension
Returns the extension used on this platform for the names of files containing shared libraries
(for example, .so under Solaris). If shared libraries aren't supported on this platform then
an empty string is returned.
info tclversion
Returns the value of the global variable tcl_version; see the tclvars manual entry for more
information.
info vars ?pattern?
If pattern isn't specified, returns a list of all the names of currently-visible variables.
This includes locals and currently-visible globals. If pattern is specified, only those names
matching pattern are returned. Matching is determined using the same rules as for string
match. pattern can be a qualified name like Foo::option*. That is, it may specify a particu-lar particular
lar namespace using a sequence of namespace names separated by ::s, and may have pattern
matching special characters at the end to specify a set of variables in that namespace. If
pattern is a qualified name, the resulting list of variable names has each matching namespace
variable qualified with the name of its namespace. Note that a currently-visible variable may
not yet "exist" if it has not been set (e.g. a variable declared but not set by variable).
SEE ALSO
global(n), proc(n)
KEYWORDS
command, information, interpreter, level, namespace, procedure, variable
Tcl 8.4 info(n)
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