/usr/bin/fv is in ftools-fv 5.3+dfsg-4.
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 | #!/bin/sh
export FITSVIEWER_LIBRARY=/usr/share/ftools/fv
export FV_HELPDIR=/usr/share/doc/ftools-fv/doc
export XLIB_SKIP_ARGB_VISUALS=1
exec wish $FITSVIEWER_LIBRARY/fvInit.tcl -- "$@"
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