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a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar

News feed reader in Opera browser

Here are some tips & tricks for Opera browser:

News feed reader

* to mark all messages inside a feed as read: CTRL + SHIFT + a

* show the news only for current week and the new posts at the top. For this you have to edit .opera/mail/index.ini, is necessary to do this modifications for every feed :

Model Age=1
Sort Type=4
Sort Ascending=0

* the update frequency at every 30 minutes:

Update Frequency=1800
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar

Protect a web directory with password 

    vim /path/of/your/dir/.htaccess

Paste this into:

    AuthType Basic
    AuthName "Private Dir"
    AuthUserFile /path/of/your/dir/.htpasswd
    require valid-user

Then we must create the password file /path/of/your/dir/.htpasswd.

We want to log in with the username "user", so we do this:

    htpasswd -c /path/of/your/dir/.htpasswd user

Enter a password for "user", and you're done!

a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar

Nice and useful commands

To capture the running state of the system. Start with the running processes on the system. Enter the following:

    (ps -aux; ps -auxeww; lsof) > current_procs.txt

Grab the contents of the /proc directory. Enter the following:

    tar -cvpf proc_directory.tar /proc/[0-9]*

Take a snapshot of the network state of the system. Enter the following:

    (date; uname -a; netstat -p; netstat -rn; arp -v) > network_status.txt

Take a snapshot of the currently active and kernel memory.

    dd bs=1024 < /dev/mem > mem
    dd bs=1024 < /dev/kmem > kmem

Taking a Disk Snapshot:

    dd if=/dev/hda1 bs=1024 > hda1
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar

Install ports collection in OpenBSD 

    $ cd /tmp
    $ ftp ftp://ftp.openbsd.org/pub/OpenBSD/4.0/ports.tar.gz
    $ cd /usr
    $ sudo tar xzf /tmp/ports.tar.gz

To install a package for the 4.1 release on an i386 machine off the ftp site (including dependencies), do:

    # export PKG_PATH=ftp://openbsd.ftp.fu-berlin.de/pub/OpenBSD/4.1/packages/i386
    # pkg_add name.tgz

Ports and Packages Update for an OpenBSD Release

To grab the stable branch for the 4.1 release:

    $ cd /usr/ports
    $ cvs -q -d anoncvs@openbsd.spline.de:/cvs up -r OPENBSD_4_1 -Pd
a silhouette of a person's head and shoulders, used as a default avatar
a silhouette of a person's head and shoulders, used as a default avatar

Generating passwords with Perl

DES:

    mkpasswd
      perl -e 'printf "%s\n", crypt("pass", "two-letter-salt")'

MD5:

    mkpasswd --hash=md5
    perl -e 'printf "%s\n", crypt("pass", "\$1\$6-8-letter-salt\$")'

PLAIN-MD5:

    perl -MDigest::MD5 -e 'printf "{PLAIN-MD5}%s\n", Digest::MD5::md5_hex("pass")'

DIGEST-MD5:

    perl -MDigest::MD5 -e 'printf "{DIGEST-MD5}%s\n", Digest::MD5::md5_hex("user:realm:pass")'