Cheatsheet: Difference between revisions

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nslookup -debug yahoo.com ==> verbose information like TTL, etc

=== ~~Misc~~ ===

=== CURL ===

* CURL

curl -I http://domain.com Get HTTP header information

curl -i http://domain.com Get HTTP header + Body information

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curl https://www.booleanworld.com/ -sSo /dev/null -w 'namelookup:\t%{time_namelookup}\nconnect:\t%{time_connect}\nappconnect:\t%{time_appconnect}\npretransfer:\t%{time_pretransfer}\nredirect:\t%{time_redirect}\nstarttransfer:\t%{time_starttransfer}\ntotal:\t\t%{time_total}\n'

* IPtables

=== IPtables ===

iptables -L ==> List rules

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* TCPDump

=== TCPDump ===

sudo tcpdump -s 0 -i ens160 host 10.1.1.1 -v -w /tmp/packet_capture.cap

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* MTR

=== MTR ===

Provides the functionality of both the ping and traceroute commands.

Prints information about the entire route.

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mtr --udp google.com UDP datagrams

* Traceroute

=== Traceroute ===

traceroute 4.2.2.2 ==> Uses UDP

traceroute -n 4.2.2.2 ==> Do not resolve hostnames

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sudo traceroute -nT 4.2.2.2 ==> Use TCP Syn (Port 80)

*Netstat

=== Netstat ===

netstat -s

netstat -a Listing all ports (both TCP and UDP)

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netstat -ant

* PS

=== PS ===

ps -aux Display all processes in BSD format

ps -eo pid,ppid,user,cmd

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ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head

* LS

=== LS ===

Append a character to each file name indicating the file type:

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-rw-r--r-- 1 root root 0 Sep 13 14:57 mtrr

</pre>

* Find Sym Links:

find . -type l -ls

ls -la | grep "\->"

== Troubleshooting ==