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Resize all JPG Files to 800×600 convert -sample 800×600 *.jpg output_file_name

Show all rpm packages installed on the system rpm -qa

Import public-key digital signature rpm –import /media/cdrom/RPM-GPG-KEY

Grep that searches recursively, ignores binary files, and doesn’t look inside Subversion hidden folders. grep -Ir –exclude=”*\.svn*” “pattern” *

Linux command to create a random password head -n1 /dev/urandom|md5sum -b|head -c 5

A simple way to create a random password in PHP $password = substr(md5(time()), 0, rand(4,8));

Install a rpm package ignoring dependencies requests rpm -ivh –nodeeps package.rpm

This command uses ffmpeg to convert a regular video into 3gp format thats used in mobile phones ffmpeg -i input_video.mp4…

Find out the ownership details of a domain using this simple command… whois openjs.com

Scan bus to identify the drives cdrecord –scanbus