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Rename files in batch

Copy ssh keys to user@host to enable password-less ssh logins.
To generate the keys use the command ssh-keygen

create pdf files from text files or stdout.

useless load
check your load with top... Start more of these jobs to get an multi-core cpu busy...

Traceroute w/TCP to get through firewalls.
man tcptraceroute

Show CPU usage for EACH cores

get the oldest file in a directory
reverse the sorting of ls to get the newest file: $ls -1tr --group-directories-first /path/to/dir/ | tail -n 1 Problems: If there are no files in the directory you will get a directory or nothing.

delete a line from your shell history
If you're a moron like me, sometimes your fingers get away from you and you, for example, enter your password when you're already authenticated to ssh-agent, sudo, etc., and your password ends up in shell history. Here's how to get it out.

run last command with root
you will be sad after you run a command and find out it needs root, so you should run it again but with prefix sudo. so this line is to make it simple. just 'sudo !!'

List installed deb packages by size


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