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