1

psql -A -F ',' -t -c 'select * from tablename;'

You can then, clearly, redirect the output as desired.

WARNING: There's no going back so make sure you do want all these config files removed and that they're not being used in any way.

1

apt-get purge `dpkg -l | awk '/^rc/ {foo = foo $2 " "} END {print foo}'`

The first task is to create a server private key. In this example, a key of 1024 bits is created and the passphrase is encrypted using tripple DES:

openssl genrsa -des3 -out server.key 1024

To create a  key without a passphrase (so there is no need to enter a passphrase when the Apache server starts for example):

openssl genrsa -out server.key 1024

or to remove a passphrase in an already existent file:

openssl rsa -in server.key -out server.key.insecure
mv server.key server.key.secure
mv server.key.insecure server.key

Generate certificate signed request (CSR)

The CSR is the file required by the certificate issuer to sign and issue a certificate and is generated as follows:

openssl req -new -key server.key -out server.csr

This requires certain bits of data to be entered:

Country Name (2 letter code) [AU]: GB
State or Province Name (full name) [Some-State]: Yorks
Locality Name (eg, city) []: York
Organization Name (eg, company) [Internet Widgits Pty Ltd]: BSDnexus
Organizational Unit Name (eg, section) []: IT
Common Name (eg, YOUR name) []: www.bsdnexus.com
Email Address []:

The completed file server.csr is ascii based and can be submitted to the CA in a variety of forms who will then issue the server.crt file

Self signed certificate

If the website is a private one, it is possible to self-sign a certificate, however, this leads to browsers complaining until an exception is applied. Currently, the following pages are displayed by two well known browsers:

Firefox and SSL cert issue

IE and SSL cert issue

SHould you still wish to sign your own CSR to generate the server.crt file, the following command can be used:

openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

Install certificates

The files can be stored anywhere on the system, however, under /etc/ssl seems customary. Ensure the files are only readable by root. If a CA has signed your CSR they will provide two files (names may be slightly different) "server.crt" and "server.ca-bundle". If you have self-signed, merely omit the reference to the .ca-bundle file.

For apache a virtual host entry could look as follows (notice the references to the files):

<VirtualHost _default_:443>
  ServerAdmin webmaster@bsdnexus.com
  DocumentRoot /usr/local/apache/share/htdocs
  ServerName www.bsdnexus.com
  SSLEngine on
  SSLCertificateKeyFile /etc/ssl/bsdnexus/server.key
  SSLCertificateFile /etc/ssl/bsdnexus/server.crt
  SSLCertificateChainFile /etc/ssl/bsdnexus/server.ca-bundle
</VirtualHost>

cat /path/to/file | awk '!/^#/ {print $0}'

[Edit]

To remove the blank lines as well as the comments, alter the awk command to

awk '!/^#|^$/ {print $0}'

Package Listing

To display all currently installed packages (including version numbers) or a specfic package:

dpkg -l [package_name]

Package Querying

To show details about a specific package:

dpkg -p {package_name}

To find out which files are installed by a package:

dpkg -L {package_name}

To find out which package installs a particular file:

dpkg -S {/path/to/file | part_of_filename}

Package Removal

To remove a package but retain the configuration files:

dpkg -r {package_name}

To remove a package including the configuration files:

dpkg -P {package_name}

options psmouse proto=imps

According to this Ubuntu source, some setups may be better with exps instead of imps.