rm -r -f YourDirectory

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

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

df -h

du -h /tmp | sort -n

top -d2

find /path/to/dir -type f -mtime +3 -exec rm {} \;

netstat -plan|grep :80|awk {'print $5'}|cut -d: -f 1|sort|uniq -c|sort -n

mysqlcheck -u root --auto-repair --optimize --all-databases

mysqldump -u [username] -p [databaseName] > [filename]-$(date +%F).sql

perl -p -i -e 's/one/two/g' *.php

zip -r file.zip /path/to/folder/or/file

unzip file.zip

tar xvf file.tar

bzip2 -dk file.bz2

find /path -type f -mtime +20 -exec mv {} /new-path \;

find /path -type f -name "*.zip" -size -1M -delete