Additional Cheatsheets

Bashscripting and CiscoIOS

Cheatsheet_BashScripting.txt

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+Simple Bash Scripting Cheatsheet
+--------------------------------
+
+[+] nano Shortcuts
+ctrl v			Next page.
+ctrl y			Previous page.
+ctrl w			Where is (find).
+ctrl k			Cut that line of test.
+ctrl x     		Exit editor.
+
+[+] Create a text file:
+touch file		Creates an empty file.
+ifconfig > tmp	pipe the output of a command
+nano file
+
+[+] Create a file and append text to it:
+ifconfig > tmp     
+echo >> tmp
+ping google.com -c3 >> tmp
+
+[+] How to view a file:
+cat file		Show entire contents of file.
+more file		Show one page at a time.  Space bar for next page and (q) to exit.
+head file		Show the first 10 lines.
+head -15 file	Show the first 15 lines.
+tail file		Show the last 10 lines.
+tail -15 file	Show the last 15 lines.
+tail -f file	Useful when viewing the output of a log file.
+
+[+] pipe
+cat tmp | grep Bcast	Feeds the output of one process to the input of another process.
+
+[+] Processes
+ps aux			Show all running process for all users.
+kill -9 PID		Nicely kill a PID.
+
+[+] Word Count
+wc -l tmp2		Count the number of lines in a file
+
+[+] cut
+-d  delimiter
+-f  fields
+
+[+] sort
+Sort by unique		sort -u file
+sort IP addresses correct		sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n
+cat tmp2 | cut -d '(' -f2 | cut -d ')' -f1 | sort -u		Isolate the IP address
+
+[+] awk
+awk '{print $1}' file 		Show the 1st column.
+awk '{print $1,$5}' file 	Show the 1st and 5th columns.
+
+[+] grep
+grep -v		Remove a single string.
+grep -v 'red' file
+
+[+] egrep -v
+Remove multiple strings	egrep -v '(red|white|blue)' file
+
+[+] sed
+sed 's/FOO/BAR/g' file 		Replace FOO with BAR.
+sed 's/FOO//g' file 		Replace FOO with nothing.
+sed '/^FOO/d' file 			Remove lines that start with FOO.
+
+[+] colour
+31=red 32=green 33=yellow 34=blue 35=magenta 36=cyan 
+echo -e "\e[1;34mThis is a blue text.\e[0m"
+
+
+
+
+Bash Scripts
+------------
+
+[+] Simple bash script:
+#!/bin/bash
+clear
+echo
+echo
+print "Hello world."
+
+[+] Make a file executable.
+chmod +x file
+chmod 755 file
+
+[+] Variables
+name=Bob
+echo $name
+user=$(whoami)
+echo $user
+echo 'Hello' $name. 'You are running as' $user.
+
+#!/bin/bash
+clear
+echo "Hello World"
+name=Bob
+ip=`ifconfig | grep "Bcast:" | cut -d":" -f2 | cut -d" " -f1`
+echo "Hello" $name "Your IP address is:" $ip
+
+[+] User Input
+read -p "Domain: " domain
+
+#!/bin/bash
+echo "Please input your domain:"
+read -p "Domain:" domain
+ping -c 5 $domain
+
+[+] Check For No User Input
+if [ -z $domain ]; then
+	echo
+	echo "#########################"
+	echo
+	echo "Invalid choice."
+	echo
+	exit
+fi

Cheatsheet_CiscoIOS.txt

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+Cisco IOS Command Line Cheatsheet
+---------------------------------
+
+--- Verify Basic Configuration:
+
+Shows information about the switch and its interfaces, RAM, NVRAM, flash, IOS, etc.
+SW1# show version
+
+Shows the current configuration file stored in DRAM.
+SW1# show running-config
+
+Shows the configuration file stored in NVRAM which is used at first boot process.
+SW1# show startup-config
+
+Lists the commands currently held in the history buffer.
+SW1# show history
+
+Shows an overview of all interfaces, their physical status, protocol status and ip address if assigned.
+SW1# show ip interface brief
+
+Shows detailed information about the specified interface, its status, protocol, duplex, speed, encapsulation, last 5 min traffic.
+SW1# show interface vlan 1
+
+Shows the description of all interfaces
+SW1# show interfaces description
+
+Shows the status of all interfaces like connected or not, speed, duplex, trunk or access vlan.
+SW1# show interfaces status
+
+Shows the public encryption key used for SSH.
+SW1# show crypto key mypubkey rsa
+
+Shows information about the leased IP address (when an interface is configured to get IP address via a dhcp server)
+SW1# show dhcp lease
+
+--- Router Modes:
+
+Router>: User mode = Limited to basic monitoring commands
+Router#: Privileged mode (exec-level mode) = Provides access to all other router commands
+Router(config)#: global configuration mode = Commands that affect the entire system
+Router(config-if)#: interface mode = Commands that affect interfaces
+Router(config-subif)#: subinterface mode = Commands that affect subinterfaces
+Router(config-line)#: line mode = Commands that affect in lines modes (console, vty, aux…)
+Router(config-router)#: router configuration mode
+
+--- Changing switch hostname:
+
+Switch(config)# hostname SW1
+
+--- Configuring passwords:
+
+SW1(config)# enable secret cisco    ! MD5 hash
+SW1(config)# enable password notcisco    ! Clear text
+
+--- Securing console port:
+
+SW1(config)# line con 0
+SW1(config-line)# password cisco
+SW1(config-line)# login
+
+--- Securing terminal lines:
+
+SW1(config)# line vty 0 4
+SW1(config-line)# password cisco
+SW1(config-line)# login
+
+--- Encrypting passwords:
+
+SW1(config)# service password-encryption
+
+--- Configuring banners:
+
+SW1(config)# banner motd $
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+UNAUTHORIZED ACCESS IS PROHIBITED
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
+$
+
+--- Giving the switch an IP address:
+
+SW1(config)# interface vlan 1
+SW1(config-if)# ip address 172.16.1.11 255.255.255.0    ! or DHCP
+SW1(config-if)# no shutdown
+
+--- Setting the default gateway:
+
+SW1(config)# ip default-gateway 172.16.1.1
+
+--- Saving configuration:
+
+SW1# copy running-config startup-config
+Destination filename [startup-config]?    ! Press enter to confirm file name.
+Building configuration…
+[OK]
+
+! Short for write memory.
+SW1# wr
+Building configuration…
+[OK]