CODEWITHSUNDEEP
powershelluser-defined-functionspowershell-3.0
user3015650
user3015650

Reputation: 13

Passing a parameter to a function

I'm trying to create a simple function based on the following by passing an argument to it. The function will search my command history looking for a string - the command works:

history | Where-Object {$_.CommandLine -match 'abc'}

From my research the closest thing to this would be:

Function FindHistory {history | Where-Object {$_.CommandLine -match '$args'}}

However I am unable to get this (or any variation) to work. FindHistory abc - should return all previous commands used with 'abc' in them.

What am I doing wrong?

btw, I've been an avid powershell user for all of 2 days - liking it :)

Upvotes: 2

Views: 110

Answers (2)

mjolinor
mjolinor

Reputation: 68273

Using $args in a where-object clause is problematic.

http://social.technet.microsoft.com/wiki/contents/articles/7821.powershell-using-args-in-script-blocks.aspx

Try this:

function findhistory ($search) {history | where-object {$_.CommandLine -match $search}}

Upvotes: 1

zdan
zdan

Reputation: 29450

Powershell won't expand variables in single quoted strings, so you have to use a double quoted string:

Function FindHistory {history | Where-Object {$_.CommandLine -match "$args"}}

Though $args is an array of all arguments, so it may be more robust if you just specify a parameter: 

Function FindHistory {PARAM($searchTerm)  history | Where-Object {$_.CommandLine -match "$searchTerm"}}

Upvotes: 4

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