When you run rkhunter on Debian Linux, you might get a warning when rkhunter is checking for hidden files and directories that some Hiffen files were found in /proc. A closer investigation in rkhunter might bring up the filenames /dev/.static, /dev/.udev and /dev/.initramfs which are normal files on Debian and not related to a attack ... Read more
Today I tested the logrotation of a Linux server installation and therefore I needed a logfile that was larger then 10 MB. To create such a file of e.g. 11 MB size on the shell, I used this command: dd if=/dev/urandom of=test.log bs=1M count=11 The content of the file are random characters. If you need ... Read more
Have you ever executed a command on the shell and noticed that you had to run it with sudo? Instead of typing the command again with "sudo" in front of it, just run: sudo !! which will execute the command that was run before with sudo. Thanks to Planetfox for this tip.
If a process is shown with process state "D" in tools like ps or top, then it's an uninterruptable process. Example: ps axl | grep D F UID PID PPID PRI NI VSZ RSS WCHAN STAT TTY TIME COMMAND 4 104 2579 9109 20 0 5024 2116 refrig D ? 0:00 cleanup -z -t unix ... Read more
Sometimes you need to know to which debian or ubuntu package a specific file belongs, e.g. because you deleted a system file and want to reinstall it. There is a handy utility called apt-file which searches for a filename in all debian packages. Installation apt-get install apt-file Usage example search for the file /etc/sysctl.conf apt-file ... Read more
The winmail.dat file is a container file format used by Microsoft Outlook to send attachments in rich-text formatted emails. To open winmail.dat on Linux, use the tnef utility. Installation sudo apt-get install tnef Usage Open a shell window, navigate to the directory where the winmail.dat file is saved, then execute the command: tnef winmail.dat to ... Read more