/usr/share/tcltk/tcllib1.19/cmdline/pkgIndex.tcl is in tcllib 1.19-dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | if {![package vsatisfies [package provide Tcl] 8.2]} {return}
package ifneeded cmdline 1.5 [list source [file join $dir cmdline.tcl]]
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