tcl7.6 User Commands - info
NAME
info - Return information about the state of the Tcl inter-
preter
SYNOPSIS
info option ?arg arg ...?
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. Procname 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 context, |
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 pat-
tern are returned. Matching is determined using the
same rules as for string match.
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 typi-
cally 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 context
Returns the fully-qualified name for the current |
namespace context. The global namespace ("::") is |
represented as a null string, making it easy to build |
namespace names like "[info context]::foo".
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 pro-
cedure. 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),
returns 0 otherwise.
info globals ?pattern?
If pattern isn't specified, returns a list of all the
names of currently-defined global variables in the |
current namespace context. If pattern is specified,
only those names matching pattern are returned. Match-
ing is determined using the same rules as for string
match.
info hostname
Returns the name of the computer on which this invoca-
tion is being executed.
info level ?number?
If number is not specified, this command returns a
number giving the stack level of the invoking pro-
cedure, or 0 if the command is invoked at top-level.
If number is specified, then the result is a list con-
sisting of the name and arguments for the procedure
call at level number on the stack. If number is posi-
tive 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 pro-
cedure, -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 variables, including
arguments to the current procedure, if any. Variables
defined with the global and upvar 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 namespace option ?arg arg ...?
A collection of queries regarding namespaces. The |
option argument should be one of the following:
info namespace all ?pattern?
Returns a list of all child namespaces in the |
current namespace context. This includes the |
direct children of the current namespace and other |
children that are visible because their parent |
namespace was imported. The direct children have |
simple names and appear first on the list; the |
imported children have fully-qualified names and |
appear at the end of the list.
info namespace children ?name?
Returns a list of all child namespaces in the |
namespace name. If name is not specified, then |
children are reported in the current namespace |
context. Unlike the "info namespace all" command, |
this command reports only the children directly |
contained within the namespace, and it reports |
them with fully-qualified names.
info namespace parent ?name?
Returns the fully-qualified name of the parent for |
namespace name. If name is not specified, then |
the parent of the current namespace context is |
reported.
info namespace qualifiers string
Returns the leading namespace qualifiers for the |
specified string. Qualifiers are namespace names |
separated by the "::" string. For the string |
"::foo::bar::x", this command would return |
"::foo::bar".
info namespace tail string
Returns the simple name at the end of qualified |
string. Qualifiers are namespace names separated |
by the "::" string. For the string |
"::foo::bar::x", this command would return "x".
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 context. If pattern is specified, only those
names matching pattern are returned. Matching is
determined using the same rules as for string match.
info protection ?-command? ?-variable? name
Returns the current protection level (public, protected |
or private) for the specified name. The protection |
level is set using the public, protected and private |
commands when a command or variable is created. The |
protection level indicates whether or not a command or |
variable can be accessed from other namespace contexts. |
See the documentation on namespace for the rules |
regarding command/variable access. If no flags speci- |
fied, or if the -command flag is included, name is |
treated as a command name. If the -variable flag is |
included, name is treated as a variable name.
info script
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. 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 exam-
ple, .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, including both
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.
info which ?-command? ?-variable? ?-namespace? name
Resolves the specified name in the current namespace |
context and returns a fully-qualified name which |
uniquely identifies it. See the documentation on |
namespace for the rules regarding name resolution. If |
no flags specified, or if the -command flag is |
included, name is treated as a command name. If the |
-variable flag is included, name is treated as a vari- |
able name. If the -namespace flag is included, name is |
treated as a namespace name.
KEYWORDS
command, information, interpreter, level, procedure, vari-
able