Kemtis Kunanuraksapong MSIS with Distinction MCTS, MCDST, MCP, A+

 Chapter 7: Working on a Pipeline  Chapter 9: Bringing Strings into the Limelight

 When you take the output of one command and direct it to the input of another command  Try this on command prompt  Ipconfig | find “ipv4 address”  Dir c:\windows\system32 | find “.exe”

 Try this:  Get-childitem c:\windows\system32 | format- table  Get-childitem c:\windows\system32 | format- list  Get-childitem c:\windows\system32 | format- wide

 Cmdlets use out-default as a default format to shows the output  All object are returned to the command as a stream of data

 Get-process | format-table  Get-process | format-table –property id, name  Get-process | format-table –property name, id  Get-process | where-object {$_.Id –gt 1000} | format- table –property name, cpu, id  $_ refers to the current object in the pipe-line  Get-process | where-object {$_.Id –gt 1000} | select-object name, cpu, id | sort-object CPU, ID

 A technical name for text  A consecutive sequence of characters  Empty VS Null Strings  Empty string – a string with zero length  Null string – undefined string (no value, no length, nothing)

 A literal string is enclosed by double quotes  “this is the a literal string” +  “… so the story continues…”  Here-Strings  $RegularString = “First Line of string`n” +  “Second line `n” +  “Third line”  Write-host $RegularString

 Here-Strings  $MyHereString  First Line of string  Second line  Third line   Write-host $MyHereString  You also can use quotation in here-string

 + (Concatenation) – to combine string together  See code in Page 120  You can implicitly or explicitly convert the data type into string  See codes in Page 121

 Method split() is used to spilt the string into array of strings  $str = “this book is good!”  $str.split()

 $myIP = “ ”  $ipArr = $myIP.split(“.”)  Write-Host (“Number of elements in ipArr” + $ipArr.length)  Write-Host (“First octet: “ + $ipArr[0])  Write-Host (“Second octet: “ + $ipArr[1])  Write-Host (“Third octet: “ + $ipArr[2])  Write-Host (“Fourth octet: “ + $ipArr[3])

 $myIP = “ ,10;100”  $ipArr = $myIP.split(“.,;”)  Write-Host (“Number of elements in ipArr” + $ipArr.length)  Write-Host (“First octet: “ + $ipArr[0])  Write-Host (“Second octet: “ + $ipArr[1])  Write-Host (“Third octet: “ + $ipArr[2])  Write-Host (“Fourth octet: “ + $ipArr[3])

 Method substring()  $name = “Steve Seguis”  $part1 = $name.substring(0,3)  $part2 = $name.substring($name.length-4,4)  Write-Host ($part1 + $part2)

 $str = “Steve is EVIL!!!”  $newstr = $str.replace(“EVIL”,”Good~”)  Write-Host $newstr

 Method IndexOf() is used to find the specific character in the string  $ =  $atpos =  $user = $ .substring(0, $atpos)  $domain = $ .substring($atpos+1, $ .length-($atpos+1))  Write-Host (“Username: “ + $user)  Write-Host (“Domain: “ + $domain)

 $ = “My_invalid_ _address”  If –lt 0){  Write-Host “Invalid address!”  }else{  Write-Host “Valid address!”  }

 Upper case  ToUpper() method  Lower case  ToLower() method

 A search pattern  [RegEx]::IsMatch(“This book is really interesting.”,”book”)  [RegEx]::IsMatch(“I have 2 siblings”,”[0-9]”)  *NOTE* It is case sensitive

 You can use escape string (\) if you want to search for special character on page 129  [RegEx]::IsMatch(“Visit us at dummies.com”,”dummies\.com”) . (dot) is a single-character wildcard  [RegEx]::IsMatch(“bell”,”.ell”)

 $username = “testuser1”  [RegEx]::IsMatch($username, “testuser[0-9]”)  If you want the name to end with either ‘a’ or ‘e’  $name = “Anna”  [RegEx]::IsMatch($name,”Ann[ae]”)

 If you want to exclude character from a match, you can negate a character set by prefixing it with the caret (^)  [RegEx]::IsMatch(“food”,”[^fh]ood”)  See Table 9-1 on Page 131 for more information

 Question mask (?) indicates that the preceding character can exist zero times or one time  [RegEx]::IsMatch(“favorite”,”favou?rite”)  [RegEx]::IsMatch(“favourite”,”favou?rite”)  [RegEx]::IsMatch(“Monday”,”Mon(day)?”)

 Plus (+) operator indicates that the preceding character can exist one or more times  [RegEx]::IsMatch(“srvfile1”,”srv[a-z0-9]+”)  [RegEx]::IsMatch(“srvfile1”,”srv[a-z]+[0-9]”)  [RegEx]::IsMatch(“Monday”,”Mon(day)?”)

 star (*) operator indicates that the preceding character can exist zero times or more times  [RegEx]::IsMatch(“Ann”,”Ann[a-z]*”)  Repetitve Format  [RegEx]::IsMatch(“96813”,”[0-9] [0-9] [0-9] [0-9] [0-9]”  [RegEx]::IsMatch(“96813”,”[0-9] {5}”

 Repetitve Format  [RegEx]::IsMatch(“96813”,”[0-9] [0-9] [0-9] [0-9] [0-9]”  [RegEx]::IsMatch(“96813”,”[0-9] {5}”  [RegEx]::IsMatch(“USERA”,”USER[A-Z]{2,5}”)  Ends in a sequence of two to five upper case letters

 ^ - the match must occur at the beginning of the string  [RegEx]::IsMatch(“SRVFILE1”,”^SRV[A-Z]+[0-9]”)  [RegEx]::IsMatch(“TESTSRVFILE1”,”^SRV[A-Z]+[0- 9]”)

 $- the match must occur at the end of the string  [RegEx]::IsMatch(“SRVFILE1”,”SRV[A-Z]+[0-9]$”)  [RegEx]::IsMatch(“TESTSRVFILE1”,”SRV[A-Z]+[0- 9]$”)  [RegEx]::IsMatch(“SRVFILE1TEST”,”SRV[A-Z]+[0- 9]$”)

 [RegEx]::IsMatch(“Dummies.com”,”[A-za-z0- 9]+\.(com|edu|net)”)

 $ =  If ($ –match  Write-Host “$ is a dummies.com address”  }

 $str = “Visit us at  $newstr = $str –replace “www\.[A-za-z0- 9]+\.(com|edu|net)”,”WEBSITE NAME KEPT SECRET”  Write-Host $newstr