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dscl . -create /Users/myuser
dscl . -create /Users/myuser UserShell /bin/zsh
dscl . -create /Users/myuser RealName "myuser" 
dscl . -create /Users/myuser UniqueID "510"
dscl . -create /Users/myuser PrimaryGroupID 20
dscl . -create /Users/myuser NFSHomeDirectory /Users/myuser
dscl . -passwd /Users/myuser password
dscl . -append /Groups/admin GroupMembership myuser

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# kadmin: GSS-API (or Kerberos) error while initializing kadmin interface
install rng-tools
edit /etc/default/rng-tools
add line HRNGDEVICE=/dev/urandom , restart rng-tools service

edit /etc/init.d/krb5-admin-server , edit variable DAEMON_ARGS="-W /dev/urandom"

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# ---- START Cisco IOS ----
interface Port-channel2
 description LACP Channel for mk2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,2
 switchport mode trunk
 spanning-tree portfast trunk
!
interface GigabitEthernet1/0/23
 description mk2 eth0

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# ----------------------------------------------------------------------------------------------------------
# PURPOSE:    Creates a byte array for use with DHCP Option 119
#
# VERSION     DATE         USER                DETAILS
# 1           07/03/2016   Craig Tolley        First version
# 1.1         08/03/2016   Craig Tolley        Fixed issue where if the whole domain matched the pointer was incorrect
# 1.2         08/03/2017   Craig Tolley        Fixed further issues where the whole domain was matched the pointers are incorrect
#                                              Modified outputs and tidied some formatting
#                                              Convert-StringToOpt119Hex option fixed to not return values for null/empty strings
#

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# Column Width
PS > Get-CsAnalogDevice | ft Identity,RegistrarPool ->  Get-CsAnalogDevice | ft Identity,RegistrarPool | out-string -Width 160

# Collections / Arrays

# It might be that the object you’re looking at is an array (a “collection”), and PowerShell is only showing the first few entries in that array, rather than the lot.
# Here, the fix is to change the $FormatEnumerationLimit value. If you type it on its own into PowerShell the current value – probably 3 – will be returned. If you set a new value of -1, it’ll output ALL entries in your collection.
PS > $FormatEnumerationLimit
3
PS > $FormatEnumerationLimit=-1

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https://www.rationallyparanoid.com/articles/hping.html
Hping usage examples
Often considered a complementary tool to Nmap, hping is used for network scanning, as well as crafting TCP/IP packets. Please note that given the packet crafting involved, if you are running as root yet you receive an error saying that the operation is not permitted it could be due to a host firewall.

Send TCP SYN packets to port 0 on host example.com (note that hping will increment the source port by 1 for each packet sent):
hping example.com -S -V

Send TCP SYN packets to port 443 on host example.com:
hping example.com -S -V -p 443

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https://www.rationallyparanoid.com/articles/netcat.html
Netcat usage examples
The following commands were done on the Linux version of Netcat.

Connect to TCP port 80 on host example.com:
nc -vv example.com 80

Port scan TCP ports 7 through 1023 on host example.com
nc -v -z example.com 7-1023

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https://www.rationallyparanoid.com/articles/wget.html
Wget is a command-line tool for retrieving files using HTTP, HTTPS or FTP.

Retrieve /images/pic01.jpg from host example.com:
wget http://example.com/images/pic01.jpg

Retrieve /images/pic01.jpg from host example.com, specifying the user agent for IE7 on a Windows XP SP2 system instead of "Wget/1.xx":
wget --user-agent="Mozilla/4.0 (Windows; MSIE 7.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)" http://example.com/images/pic01.jpg

Retrieve /images/pic01.jpg from host example.com, specifying "http://anothersite.example.com/search?hl=en&q=pictures" as the referer:

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http://brandon.penglase.net/index.php?title=Getting_*nix_to_Netboot_Macs

class "Apple-Intel-Netboot" {
 2 	# Limit this class to only Intel Apple machines
 3 	match if substring (option vendor-class-identifier, 0, 14) = "AAPLBSDPC/i386";
 4 	option dhcp-parameter-request-list 1,3,17,43,60; # Send these options to the client (possibly forcing it, if the client didn't request it)
 5 							# From: http://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xml
 6 							# 1 - Subnet Mask
 7 							# 3 - Router
 8 							# 17 - Root Path

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https://askubuntu.com/questions/457016/how-to-change-gsettings-via-remote-shell

#!/bin/bash

# Remember to run this script using the command "source ./filename.sh"

# Search these processes for the session variable 
# (they are run as the current user and have the DBUS session variable set)
compatiblePrograms=( nautilus kdeinit kded4 pulseaudio trackerd )