Crucial Web Hosting

iptables -I INPUT -s 25.22.22.22 -j DROP

netstat -plan | grep :80 | grep -E "(EST|LIST)" | awk {'print $5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1

mail -s "Subject" email@address.com < message.txt

cd /usr/src/
wget http://www.configserver.com/free/csf.tgz
tar -xzf csf.tgz
cd csf
sh install.sh

Display how much CPU a process is using:

ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -1

For example, show top five CPU using processes:

ps -eo pcpu,pid -o comm= | sort -k1 -n -r | head -5

Which will output the following:

0.6 24458 bash
0.3 24457 cphulkd.pl
0.2  7704 php5
0.1  7706 php5
0.1  7705 php5

ps axu

Show full command in ps display:

ps axu --width=500

mysqladmin -u root password NEWPASSWORD

mysqladmin -u root -p OLDPASSWORD NEWPASSWORD

The criteria for this regular expression is as follows:

• Contains at least one (1) uppercase letter
• Contains at least one (1) lower case letter
• Contains at least one (1) number or special character
• Contains at least eight (8) characters

(?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$

find . ! -name "*.php" -exec rm -f {} \;

find . -name *.DS_Store -type f -exec rm {} \;

This will delete all files in the current directory that have a size of zero.

find . -type f -size 0k -exec rm {} \; | awk '{ print $8 }'

find . -type f -iname "*.mp3" -exec rename "s/ /_/g" {} \;

Get the basename (full file name with no path), file name (including extension), and file extension:

filename=$(basename $pathandfile)
extension=${filename##*.}
filename=${filename%.*}

# 20090703
date +"%Y%m%d"

To use tabs, returns, and other formatting characters when using the echo command, be sure to specify the -e option:

echo -e "test \t\t This text is tabbed twice."

find . -type f -print | xargs sed -i -e 's/FIND/REPLACE/g'

Leave off the final pipe to /bin/sh to test:

ls foo*.jpg | awk '{ print("mv "$1" "$1) }' | sed 's/foo/bar/2' | /bin/sh