Crucial Web Hosting

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

iptables -I INPUT -s 25.22.22.22 -j DROP

find . -type d -exec chmod 755 {} \;

find . -type f -exec chmod 644 {} \;

ls -ld /proc/{pid}

curl -o /dev/null -w %{time_total}\\n http://www.example.com

clear

yes n | cp -i source/* dest/

ln -s /source/file ./destination/file

touch myfile.txt

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

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 }'

Delete files older than X days:

find . -type f -mtime +X -exec rm {} \;

If you want to search a specific directory:

find /path/to/files -type f -mtime +X -exec rm {} \;

You can also delete directories by switching the flag type:

find . -type d -mtime +X -exec rm {} \;

gsed '0,/find/s//replace/'

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

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

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

find . -printf '%i\n' | sort -u | wc -l

ls -alrt

for i in `find -type d -maxdepth 1`; do echo -n $i; echo -n " "; find $i | wc -l ; done

netstat -atun | awk '{print $5}' | cut -d: -f1 | sed -e '/^$/d' |sort | uniq -c | sort -n

#!/bin/bash
w="$1"
 
[[ -n "$w" ]] || w=12
if [[ $w -lt 8 ]]; then
    echo "A password of length $w would be too weak."
    exit 1
fi
passwd=$( cat /dev/urandom | tr -dc "a-zA-Z0-9_\?\$\#\." | fold -w $w | head -1 )
echo "${passwd}"

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

find . -type d -name .svn -print0 | xargs -0 rm -rf

You can also run the following command:

find . -type d -name .svn -exec 'rm -rf {}\;'

This command will recursively search for a file and remove it.

For example, if you wanted to delete all index.html files, you would do this:

find ./ -name 'index.html' -exec rm '{}' ';' -print

If you wanted to remove all files ending in .html, you would do this:

find ./ -name '*.html' -exec rm '{}' ';' -print

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

If your index.html and index.php files have suffered from an iframe injection, you can use the following grep/sed command for clearing it out.

Please be careful and test first with just the grep command to ensure you don't clear out anything you don't need.

This command does not backup files!

grep -lr -e '<iframe src="http://.*</iframe>' * | xargs sed -i 's/<iframe src="http:\/\/.*<\/iframe>//g'

rename 'y/A-Z/a-z/' *

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

mysqladmin -u root -p OLDPASSWORD NEWPASSWORD

find . -type f -exec grep -l 'KEYWORDS' {} /dev/null \;

find . -name "*.php" -exec grep string {} \; -exec echo -e {} \;

scp -r user@127.0.0.1:/remote/file ./local/file

mysqladmin -u root password NEWPASSWORD

ps axu

Show full command in ps display:

ps axu --width=500

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

du --max-depth=1 /home/ | sort -n -r

STRING_VAR=`expr "$STRING_VAR" : '[[:space:]]*\(.*\)[[:space:]]*$'`

for i in `ls -1 *.gz`; do tar xzvf $i;rm $i; done

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."

netstat -tulpn | less