Useful day-to-day linux commands to know

Make directory recursive (that is create all subdirectories if they are missing)

$> mkdir -p /opt/mediagateway/var/lib/gateway/settings/

Find filename that matches string

$> sudo find / -name admin_*
In this case it will search all files that begins with admin_

Search inside files for content matching string

$> sudo grep -R "my-regular-expression-search" /

on some distributions the -R is lowercase :

$> sudo grep -r "my-regular-expression-search" /

Find network ports opened

netstat -a
netstat -a | grep TIME_WAIT | wc -l
netstat -a | grep TIME_WAIT | grep ":8080 " | wc -l

Killing processes piped

ps -ef | grep phantom | grep -v grep | awk '{print $2}' | xargs kill -9

or simpler if you have killall

sudo killall -9 phantomjs