/usr/share/doc/tclcurl/examples/command.tcl is in tclcurl 7.22.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | package require TclCurl
curl::transfer -url "127.0.0.1" -command "puts \"\nTransfer complete\n\""
|