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It depends on what type of data/objects you are dealing with. &nbsp;Normally, I would say to bring the keys of your target collection into a hash table and then check to see whether new item keys already exist in the hash table before adding/appending.
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It depends on what type of data/objects you are dealing with.  Normally, I would say to bring the keys of your target collection into a hash table and then check to see whether new item keys already exist in the hash table before adding/appending.

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Hi Aikimark, how would that be possible<br />
<br />
thanks
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Hi Aikimark, how would that be possible

thanks

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As said, that requires that you can isolate an unique key element to determine if each entry is new or not. You need to have knowledge about the meaning and layout of the output. E.g. if you want to have a scan over PCs for reachability, and only need to know whether they have been reachable at least once out of n tests, that would make up a list (PC, reachable, last fail or first success time stamp), where you change existing records (or not) and add non-exisiting ones.
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As said, that requires that you can isolate an unique key element to determine if each entry is new or not. You need to have knowledge about the meaning and layout of the output. E.g. if you want to have a scan over PCs for reachability, and only need to know whether they have been reachable at least once out of n tests, that would make up a list (PC, reachable, last fail or first success time stamp), where you change existing records (or not) and add non-exisiting ones.

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Thought it was worth a try <br />
<br />
Thanks
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Hi all i have a script that i will be running several times and combining into a single file. <br />
Is there a way to append only new entries into the file as currently its adding all entries which essentially become duplictaes<br />
<br />
thanks
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Hi all i have a script that i will be running several times and combining into a single file. 
Is there a way to append only new entries into the file as currently its adding all entries which essentially become duplictaes

thanks

Powershell appending files

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.

Powershell

A scripting language is a programming language that supports scripts, programs written for a special run-time environment that automate the execution of tasks that could alternatively be executed one-by-one by a human operator. Scripting languages are often interpreted (rather than compiled). Primitives are usually the elementary tasks or API calls, and the language allows them to be combined into more complex programs. Environments that can be automated through scripting include software applications, web pages within a web browser, the shells of operating systems (OS), embedded systems, as well as numerous games. A scripting language can be viewed as a domain-specific language for a particular environment; in the case of scripting an application, this is also known as an extension language.

Scripting Languages

The term 'shell' refers to a general class of text-based command interpreters most often associated with the UNIX and Linux operating systems. Popular shells include Bourne, Debian Almquist (dash), Korn (ksh), Bourne Again (bash) and the C shell family (csh). Some view the DOS 'cmd' prompt as a minimal shell of sorts. It is also possible to install Cygwin on Windows and emulate a full Unix environment with complete shell capabilities. Terminal emulators, such as xterm, GNOME Terminal and OS X Terminal, can be used to access shell.