Nmap is really useful network scanner that help us identify live hosts in the internet.
become root user
[php]su
cd /usr/ports/security/nmap
make install clean[/php]
Run nmap program
nmap -sS -v okedot.com
Tag Archives: FreeBSD
Find Out Operating System Version
Sometimes we need to determine what version of our OS. Mostly for all unix, linux os we can do it with ‘uname’ command. for FreeBSD it works well and we can see directly what version our FreeBSD is, but for ubuntu and centos we can get it straight what we need because instead of display OS version its just will display the kernel version.
then i find out that we can use this command
1. cat /etc/issue
2. /etc/lsb-release
3. cat /etc/apt/sources.list (by seeing repository)
On debian u can use this command (in order)
1. cd /etc
2. ls | grep version
On FreeBSD
1. uname -a
How To List Hardware on FreeBSD
u can use sysctl and dmesg to list all your hardware on freebsd
example
# sysctl -a
then use grep and egrep to choose what hardware you like to display
1. CPU
# sysctl -a | egrep -i 'hw.machine|hw.model|hw.ncpu'
2. Memory
# sysctl -a | grep mem
or for good display u can see this page
http://www.cyberciti.biz/faq/freebsd-command-to-get-ram-information/
3. Harddisk
# egrep 'ad[0-9]|cd[0-9]' /var/run/dmesg.boot
4. Ethernet
# ifconfig
Restart Crontab on FreeBSD and Linux
Cron is one of the most useful utilities in FreeBSD. Cron is application that running in background that checks file /etc/crontab constantly, it is usually used for automatic commands execution. Using cron and this crontab file you can also start any service you want automatically or scheduled.
1. to change crontab or edit crontab file (using ee or vi)
ee /etc/crontab
you will see lines like this
PATH=/etc:/bin:/sbin:/usr/bin:/usr/sbin Continue reading Restart Crontab on FreeBSD and Linux
Pwgen Tutorial Generate Random Password in Linux Unix
Sometimes we need to generate random password to provide rather secure login mecanism for our system. For example if we want to change password randomly for our ftp user. This can be done by using pwgen command. In pwgen man page, i found explanation to use this command. here i will give u the example:
1. basic usage :
pwgen maxleght,
example basic pwgen command and its result:
%pwgen 8
ookokee
it will generate 8 letter password like ookeokee
2. other usage Continue reading Pwgen Tutorial Generate Random Password in Linux Unix