Show MAC addresses on Cisco 2960 and where they're connected

sh mac address-table dynamic

Blocking machines on Cisco 2960 via MAC address

mac-address-table static 1caf.f735.411e vlan 1 drop

where 1caf.f735.411e is the MAC address of the machine you want to block.

Stuck on ROMMON

1. rommon #0> PORT=Ethernet0/0
Ethernet0/0
Link is UP
MAC Address: 001b.d554.512a
2. rommon #1> ADDRESS=10.10.10.1
3. rommon #2> SERVER=10.10.10.2
4. rommon #3> GATEWAY=10.10.10.2
5. rommon #4> IMAGE=asa804-23-k8.bin
6. rommon #5> tftp

After booting:
1. ciscoasa(config)# format flash
2. ciscoasa(config)# write mem
3. ciscoasa(config)# interface ethernet 0/0
4. ciscoasa(config-if)# ip address 10.10.10.1 255.0.0.0
5. ciscoasa(config-if)# no shut
6. ciscoasa(config-if)# name if outside
7. ciscoasa(config-if)# security-level 100
8. ciscoasa(config)# ip route 0.0.0.0 0.0.0.0 10.10.10.2
9. ciscoasa# copy tftp: flash:
10. ciscoasa# write mem

Clear ASA Configuration

rommon #1>confreg 0x41
rommon #2>boot
ciscoasa > en [when asked for password just press enter]
ciscoasa # conf t 
ciscoasa (config)# config-register 0x01 
ciscoasa (config)# copy run start
ciscoasa (config)# reload

Rename files with spaces to dash

find . -maxdepth 1 -type f | rename 's/ /-/g'

PERL: Install all prerequisites

cpan> o conf prerequisites_policy follow
cpan> o conf commit

VMWare stuff

How to access the VMware ESXi hidden console
Top 10 things you must read about ESXi
How to open CLI to VMware ESXi. How to Clone Virtual Machines
VMware ESXi: Free Hypervisor for everyone
How to Set Up Your Own VMware ESXi4 Server

or search "vmware esxi tutorial" on google

Sending mail using mutt

mutt -s "subject" -a filename1 -a filename2 email@example.com -c ccdemail@example.com -i filenamecontainingmessage.txt

SSH (Commercial) Mirror

http://mirror.pa.msu.edu/ssh/

Removing leading zero using awk

Had to extract data from rrdtool and feed it to Zabbix. Problem was I kept getting leading zero variables. This removes any leading zero:

rrdtool fetch lighttpd.rrd AVERAGE -s -60s \
| grep -v nan \
| grep -v Requests \
| awk '{printf "%d",$2}' \
| awk '{print $1 + 0}'

to test it yourself:

echo 000000105 | awk '{ print $1 + 0}'

Look for folders with world write bit on

$FIND $DIRNAME -xdev -perm +o=w ! \( -type d -perm +o=t \) ! -type l -print

Look for scripts with setuid on

$FIND $DIRNAME -xdev -type f -perm +u=s -print

Find all superuser accounts

grep -v -E "^#" /etc/passwd | awk -F: '$3 == 0 { print $1}'

Delete old files on lighttpd cache

find ${CROOT} -type f -mtime +${DAYS} -delete

rename files to lowercase

lowercase=$(echo $file | tr '[A-Z]' '[a-z]'])

Delete even/odd lines on a text file

sed ‘0~2d’ -i file

Count number of files in each directory

find -type f -execdir pwd \; | sort | uniq -c

Perl to the rescue... again

Search and replace multiple files:

perl -pi -w -e 's/WU/WU2/g;' *.xml

Debian/Ubuntu Perl Building

apt-get install dh-make-perl
dh-make-perl --cpan Your::CPAN::Package --install

Installing Google Chrome for Debian/Ubuntu Linux

Follow this link:
64bit: http://www.google.com/chrome/intl/en/eula_dev.html?dl=unstable_amd64_deb
32bit: http://www.google.com/chrome/intl/en/eula_dev.html?dl=unstable_i386_deb