/usr/share/doc/libplplot12/examples/tk/plgrid is in plplot-tcl-dev 5.10.0+dfsg2-0.1ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
# Run plserver example for plgrid.tcl. N.B. must be run in ../tcl directory.
/usr/bin/plserver <<EOF
plstdwin .
plxframe .plw
pack append . .plw {left expand fill}
source plgrid.tcl
proc 1 {} "plgrid .plw.plwin"
1
EOF
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