An example to namespace children command :
puts [info patchlevel]
# Tcl
set tclVersion [package require Tcl]
puts "Tcl ($tclVersion)"
puts [lsort [namespace children]]
set tkVersion [package require Tk]
# Tk
puts "Tk ($tkVersion)"
puts [lsort [namespace children]]
exit
$ tclsh namespaces.tcl
8.4.17
Tcl (8.4)
::activestate ::platform ::tcl
Tk (8.4)
::activestate ::auto_mkindex_parser ::critcl ::dom ::msgcat ::pkg ::platform ::tcl ::tk ::vfs ::xml
$ tclsh85 namespaces.tcl
8.5.7
Tcl (8.5.7)
::activestate ::platform ::tcl
Tk (8.5.7)
::activestate ::auto_mkindex_parser ::msgcat ::pkg ::platform ::tcl ::tk ::ttk