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/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-real-debug/bin/popup is in libpetsc3.7.7-dbg 3.7.7+dfsg1-2build5.

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The actual contents of the file can be viewed below.

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#! /bin/ksh -f
# $Id: popup,v 1.2 2000/04/24 04:03:44 bsmith Exp $ 
#
#   popup
#
#   This is used by the PETSc routine PetscPopUpSelect()
# 
echo $1
shift
select x
do
#
#  check if reply is greater than 0 and less than number of choices + 1
#
  if [ $REPLY > 0 ] ; then
    echo $REPLY > ~/.popuptmp
    exit
  fi
done