4 January 2015
If you accidently deleted a text-file, you might be able to recover it using grep:
$ grep --binary-files=text --context=x 'stringfromyourfile' \
/dev/whateverPartition > someFile.txt
x are the lines before and after the string.
I found this idea on this blog.
3 January 2015
Today I upgraded Thunderbird and then my SSL-connections to postfix did not work. In /var/log/mail.log i found the following:
SSL3_READ_BYTES:tlsv1 alert unknown ca:s3_pkt.c:1258:SSL alert number 48:
After a while i found this solutions
Just change the following thunderbird-setting:
security.use_mozillapkix_verification to false
22 December 2014
I wish you a very merry christmas and a geeky new year…
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22 December 2014
If you have thousands of emails in your mailbox, the fastest way to delete them all is by open the maildir in mutt( mutt -f MAILDIR ) and do the following:
D(shift+d)
and then:
~s .*
19 December 2014
I wrote an article about “List disk usage of files and directories”. A more “graphical” way to do this is using ncdu. It’s a very useful, neat little ncurses programm.
16 December 2014
This script checks if a dns-zone-transfer for a specific domain is possible on it’s domain-servers. A zonetransfer should for security reasons only be possible between 2 trusted dns-servers.
DOMAIN="example.com" && for i in `host -t ns $DOMAIN | awk '{print $4}'`; do host -a -l $DOMAIN $i; done
16 December 2014
Sometimes it is neccessary to copy the partition-table of one disk to another. Mostly this is needed when a disk should be replaced on a software-raid-array. The method described here also works for GPT-Tables..
16 December 2014
Generate encrypted password (md5)
openssl passwd -1 'notsosecret'
My name is Wolfgang Hotwagner. I am a Linux and Information Security enthusiast from Vienna. This blog is about my journey through Computer Science.
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