This file is indexed.

postinst is in libslepc-complex-3.7.3 3.7.3+dfsg1-5.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh -e

DEB_HOST_MULTIARCH=x86_64-linux-gnu

SLEPC_VERSION=3.7.3
SLEPC_VERSION_NUMBER=$( echo ${SLEPC_VERSION} | sed "s/\.//g" )
SONAME=3.7

# Make alternatives links
if [ "$1" = "configure" ]; then
  # alternative slepc version (for given soname), real or complex
  update-alternatives --install /usr/lib/${DEB_HOST_MULTIARCH}/libslepc.so.${SONAME} libslepc.so.${SONAME} /usr/lib/${DEB_HOST_MULTIARCH}/libslepc_complex.so.${SLEPC_VERSION} ${SLEPC_VERSION_NUMBER}73 \
    --slave /usr/lib/${DEB_HOST_MULTIARCH}/libslepc.so.${SLEPC_VERSION} libslepc.so.${SLEPC_VERSION} /usr/lib/${DEB_HOST_MULTIARCH}/libslepc_complex.so.${SLEPC_VERSION}

  # alternative complex version (for given soname)
  update-alternatives --install /usr/lib/${DEB_HOST_MULTIARCH}/libslepc_complex.so.${SONAME} libslepc_complex.so.${SONAME} /usr/lib/${DEB_HOST_MULTIARCH}/libslepc_complex.so.${SLEPC_VERSION} ${SLEPC_VERSION_NUMBER}77
fi