Top REQUEST methods
varnishtop -i ReqMethod

Top URLs that MISS the cache
varnishtop -i BereqURL

Top URLS that HIT the cache
varnishtop -i ReqURL

All URLs that HIT the cache in real time
varnishlog -g request -q ‘VCL_call eq HIT’ | grep reqURL

All URLs that MISS the cache in real time
varnishlog -g request -q ‘VCL_call eq MISS’ | grep reqURL

All URLs that MISS the cache in real time
varnishlog -i BereqURL

Look at an incoming client request of a specific URL
varnishlog -c -q “ReqUrl eq ‘/'”

Look at a a backend request of a specific URL
varnishlog -i -q “BereqURL eq ‘/'”

See requests for one specific Hostname
varnishlog -c -q “ReqHeader eq ‘Host: www.mydomain.com'”

See the age of the cache objects for a specific hostname
varnishlog -c -q “ReqHeader eq ‘Host: www.mydomain.com'” | grep Age

All 404
varnishlog -b -q “ObjStatus eq 404”

Cut out selected fields of each line of a file.

Syntax

cut [-b] [-c] [-f] list [-n] [-d delim] [-s] [file]

Example: Use cut to get your ipv4 IP address:

ifconfig eth0 |grep 'inet addr' |cut -d ':' -f 1,2 | cut -c 21- | cut -c -14

This command is useful for search through log files. Where you want to match two keywords

Contents of the file test.txt

windows
linux windows
windows linux
nothing

This egrep command only matches linux windows

egrep "\<linux\>.*\<windows\>" test.txt

This will remove your current user name display.

Edit the lightdm config file:

sudo gedit /etc/lightdm/lightdm.conf

And append this line to the end of the file:

allow-guest=false

Safe the file and either reboot your computer or restart lightdm

sudo /etc/init.d/lightdm restart

this will close any application you have running

To search a directory for files with the extension .conf and replace the IP address 213.161.99.99 with 213.161.91.99. Do the following:

find . -name '*.conf' | xargs perl -pi -e 's/213.161.99.99/213.161.91.99/g'

Thats it have fun.