#!/bin/bash
if [[ $(/usr/bin/id -u) -ne 0 ]]
> then
>   echo 'Please run this script as the "root" user (uid 0).'
>   exit 1
> fi
if [[ ! -x /usr/bin/apt-show-versions ]]
> then
>   echo 'To use this script, please run this command first:'
>   echo '  sudo apt install apt-show-versions'
>   exit 2
> fi
To use this script, please run this command first:
  sudo apt install apt-show-versions
exit
/usr/bin/apt-get update --quiet=2 --download-only
E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied)
E: Unable to lock directory /var/lib/apt/lists/
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
FOREIGN=$(tempfile --prefix=fopa_)
/usr/bin/apt-show-versions | grep -Ev ' (uptodate|not installed)$' > $FOREIGN
-bash: /usr/bin/apt-show-versions: No such file or directory
if [ -e $FOREIGN ]
> then
>   echo 'Packages / package versions which are installed but of unknown origin:'
>   cat $FOREIGN
> else
>   echo 'Note: No packages / package versions of unknown origin were found' >&2
> fi
Packages / package versions which are installed but of unknown origin:
rm $FOREIGN