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Comment: Added wget

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To try to fix your PostgreSQL installation in a debian or similar environment:

Overall (several variants, read before execution)

No Format
# download
cd /tmp
wget https://download.clazzes.org/pg_fix_usermappings/pg_fix_usermappings.sh# make it executable, for user postgres
chmod ugo+rx pg_fix_usermappings.sh


# it's safe to call the script without any parameters ...
pg_fix_usermappings.sh


# execute for 9.6 as root
sudo -u postgres pg_fix_usermappings.sh 9.6


# or execute for 9.6 as non-root
sudo sudo -u postgres pg_fix_usermappings.sh 9.6

# #or execute for 9.6 for the bold skipping do-you-really-want-it backcheck
sudo sudo -u postgres pg_fix_usermappings.sh --yes 9.6

# #or recommendation:execute loglogging the output
( sudo sudo -u postgres pg_fix_usermappings.sh 9.6 ) 2>&1 |tee /var/tmp/pg_fix_usermappings.log
# after success
sudo mv /var/tmp/pg_fix_usermappings.log /var/log/postgresql/

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