{"id":15,"date":"2014-11-06T03:43:25","date_gmt":"2014-11-06T03:43:25","guid":{"rendered":"http:\/\/parablog-wordpress.dockerbox.rei.moe\/?p=15"},"modified":"2014-11-06T04:20:40","modified_gmt":"2014-11-06T04:20:40","slug":"arrays-in-powershell","status":"publish","type":"post","link":"https:\/\/blog.lewys.eu\/?p=15","title":{"rendered":"Arrays in powershell"},"content":{"rendered":"

Reference sheet for my powershell class<\/em><\/p>\n

Arrays seem to be like small temporary databases ? \ud83d\ude00<\/p>\n

 <\/p>\n

Creating an Array:<\/p>\n

C:\\PS>$numbers = @(4,7,9,11,20)<\/strong>\u00a0\u00a0\u00a0\u00a0 \/\/creates array and populates entries with data<\/span>
\nC:\\PS>write-host $numbers<\/strong>\u00a0\u00a0\u00a0\u00a0 \/\/prints entire array
\n<\/span><\/p>\n

Number 9 can be retrieved with<\/p>\n

C:\\PS>$numbers[2]<\/strong>\u00a0\u00a0\u00a0 \/\/prints 3rd item in array (integers start at 0<\/p>\n

similarly<\/p>\n

C:\\PS>write-host $numbers[2] “this is the second item in the array”<\/strong>\u00a0\u00a0\u00a0 \/\/includes text at the end and uses the write-host command<\/p>\n

C:\\PS>$names = @(“Martin”, “Emma”, “Alan”, “Laura”)<\/strong>
\n<\/span>\u00a0\u00a0\u00a0 \/\/this is how words are stored into an array.<\/p>\n

Or you can \u00a0<\/span>can create an empty array and then add elements later:<\/p>\n

C:\\PS>$MoreNames = @()<\/strong>\u00a0<\/span>
\nC:\\PS>$MoreNames += “Emma”<\/strong>\u00a0<\/span>
\nC:\\PS>$MoreNames += “John”<\/strong>\u00a0<\/span>
\nC:\\PS>$MoreNames += “Gerald”<\/strong>
\n<\/span><\/p>\n

The size of the array can be retrieved with the commands<\/p>\n

C:\\PS>$ArrayName.count<\/strong>\u00a0<\/span><\/p>\n

OR
\nC:\\PS>$ArrayName.length<\/strong><\/p>\n

(Both these seem to return the same values)<\/p>\n

An array can be auto populated with a number range by using double dots to tell powershell to fill in the gap. eg:<\/p>\n

C:\\PS>$range = @(10..50)<\/strong>
\n<\/span><\/p>\n

Will create an array containing the numbers 10, through to and including 50.<\/p>\n

To retrieve the last item from the array, you can use either<\/p>\n

C:\\PS>$array[$array.Length-1]<\/strong>
\n<\/span><\/p>\n

OR<\/p>\n

C:\\PS>$array[-1]<\/strong><\/p>\n

To retrieve the FIRST item in an array, you first get the length, you substitute the [-1]<\/strong> with [-$array.count] <\/strong>. Or any variation of these to your desired item.<\/p>\n

\u00a0T<\/span>o store the output from a command to an array, use cmdlets:<\/p>\n

C:\\PS>$array = Get-Process<\/strong><\/p>\n

To create an array that already has item spaces for a set amount of items, you can use:<\/p>\n

C:\\PS>$NameArray = New-Object String[] 8\u00a0<\/span><\/strong>
\nC:\\PS>$IntArray = New-Object Int[] 12
\n<\/span><\/strong><\/p>\n

Beginning Assignment:<\/p>\n

CLS\u00a0 #clears all the crap off the screen from the last thing i ran \ud83d\ude00<\/p>\n

write-host “Press any key to Start”
\n$x = $host.UI.RawUI.ReadKey(“NoEcho,IncludeKeyDown”) #waits for a key to be pushed before continuing
\nwrite-host “”
\nwrite-host “Generating random numbers”<\/p>\n

$Item0 = Get-Random -minimum 0 -maximum 99 #Generates a random number between 0 and 99 and stores it in $Item0
\n$Item1 = Get-Random -minimum 0 -maximum 99
\n$Item2 = Get-Random -minimum 0 -maximum 99
\n$Item3 = Get-Random -minimum 0 -maximum 99
\n$Item4 = Get-Random -minimum 0 -maximum 99
\n$Item5 = Get-Random -minimum 0 -maximum 99
\n$Item6 = Get-Random -minimum 0 -maximum 99
\n$Item7 = Get-Random -minimum 0 -maximum 99
\n$Item8 = Get-Random -minimum 0 -maximum 99
\n$Item9 = Get-Random -minimum 0 -maximum 99<\/p>\n

$RandomArray = @($Item0, $Item1, $Item2, $Item3,$Item4,$Item5,$Item6,$Item7,$Item8,$Item9) #stores the randomly generated numbers into $RandomArray
\nwrite-host “”
\nwrite-host “Now all the numbers are generated and stored in the `$RandomArray` array,”
\nwrite-host “we will use a sort that puts the largest into the”
\nwrite-host “variable until its reached the end of the array.”
\nwrite-host “”
\n[array]::sort($RandomArray) #sorts the array ?<\/p>\n

write-host “”
\nwrite-host “The largest number in the array is” $RandomArray[-1] #writes out the last item of $RandomArray
\nwrite-host “”<\/p>\n

 <\/p>\n

update: next exercise involved those freaking factorials, i am once again lost and unsure how to continue <,<<\/p>\n

WHY DO I GET STUCK ON THESE<\/p>\n

also, i cant get loops into my head in this stupid language, why is C\/C++ easier than this ?<\/p>\n

isn’t powershell meant to be a baby language or something?<\/p>\n","protected":false},"excerpt":{"rendered":"

Reference sheet for my powershell class Arrays seem to be like small temporary databases ? \ud83d\ude00   Creating an Array: C:\\PS>$numbers = @(4,7,9,11,20)\u00a0\u00a0\u00a0\u00a0 \/\/creates array and populates entries with data C:\\PS>write-host $numbers\u00a0\u00a0\u00a0\u00a0 \/\/prints entire array Number 9 can be retrieved with C:\\PS>$numbers[2]\u00a0\u00a0\u00a0 \/\/prints 3rd item in array (integers start at 0 similarly C:\\PS>write-host $numbers[2] “this … Continue reading Arrays in powershell<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,22],"tags":[6,5,3,2,4],"class_list":["post-15","post","type-post","status-publish","format-standard","hentry","category-educational","category-reference","tag-lesson","tag-notes","tag-powershell","tag-programming","tag-rant"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=\/wp\/v2\/posts\/15","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=15"}],"version-history":[{"count":4,"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=\/wp\/v2\/posts\/15\/revisions"}],"predecessor-version":[{"id":19,"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=\/wp\/v2\/posts\/15\/revisions\/19"}],"wp:attachment":[{"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.lewys.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}