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List row counts for all tables in a database with PostsreSQL

Last updated: 10/11/2015

To list the number of rows for each table in the current database with PostgreSQL, use the following SQL statement:...

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Explicitly disable SSL / TLS for a host when sending email via sendmail

Last updated: 14/10/2015

Once the sendmail mail server is configured with its own SSL certificate it will try and initiate TLS/SSL connections with all other SMTP servers if they advertise supporting TLS or SSL....

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Forcing sendmail to flush its host status

Last updated: 25/09/2015

If sendmail has a temporary problem delivering mail to another mail server then it will store the email in its queue and record the status of the destination host. When another ...

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Removing an entry from Squid proxy's cache

Last updated: 15/08/2015

Sometimes there is a need to delete a file that squid proxy has already downloaded and stored in its cache....

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