diff options
Diffstat (limited to 'doc/unknown.n')
| -rw-r--r-- | doc/unknown.n | 23 |
1 files changed, 9 insertions, 14 deletions
diff --git a/doc/unknown.n b/doc/unknown.n index 6ece5f3..82dcefc 100644 --- a/doc/unknown.n +++ b/doc/unknown.n @@ -4,11 +4,9 @@ '\" '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. -'\" -'\" RCS: @(#) $Id: unknown.n,v 1.6 2006/02/01 18:27:43 dgp Exp $ -'\" -.so man.macros +'\" .TH unknown n "" Tcl "Tcl Built-In Commands" +.so man.macros .BS '\" Note: do not modify the .SH NAME line immediately below! .SH NAME @@ -16,22 +14,21 @@ unknown \- Handle attempts to use non-existent commands .SH SYNOPSIS \fBunknown \fIcmdName \fR?\fIarg arg ...\fR? .BE - .SH DESCRIPTION .PP This command is invoked by the Tcl interpreter whenever a script -tries to invoke a command that doesn't exist. The default implementation +tries to invoke a command that does not exist. The default implementation of \fBunknown\fR is a library procedure defined when Tcl initializes an interpreter. You can override the default \fBunknown\fR to change its functionality, or you can register a new handler for individual namespaces -using the \fBnamespace unknown\fR command. Note that there is no default +using the \fBnamespace unknown\fR command. Note that there is no default implementation of \fBunknown\fR in a safe interpreter. .PP If the Tcl interpreter encounters a command name for which there -is not a defined command (in either the current namespace, or the +is not a defined command (in either the current namespace, or the global namespace), then Tcl checks for the existence of an unknown handler for the current namespace. By default, this -handler is a command named \fB::unknown\fR. If there is no such +handler is a command named \fB::unknown\fR. If there is no such command, then the interpreter returns an error. If the \fBunknown\fR command exists (or a new handler has been registered for the current namespace), then it is invoked with @@ -54,7 +51,7 @@ If the auto-load fails then \fBunknown\fR calls \fBauto_execok\fR to see if there is an executable file by the name \fIcmd\fR. If so, it invokes the Tcl \fBexec\fR command with \fIcmd\fR and all the \fIargs\fR as arguments. -If \fIcmd\fR can't be auto-executed, \fBunknown\fR checks to +If \fIcmd\fR cannot be auto-executed, \fBunknown\fR checks to see if the command was invoked at top-level and outside of any script. If so, then \fBunknown\fR takes two additional steps. First, it sees if \fIcmd\fR has one of the following three forms: @@ -85,12 +82,10 @@ rename \fBunknown\fR _original_unknown # Provide our own implementation proc \fBunknown\fR args { puts stderr "WARNING: unknown command: $args" - uplevel 1 [list _original_unknown {expand}$args] + uplevel 1 [list _original_unknown {*}$args] } .CE - .SH "SEE ALSO" info(n), proc(n), interp(n), library(n), namespace(n) - .SH KEYWORDS -error, non-existent command +error, non-existent command, unknown |