Powershell Working with Running Processes

	# List all the running processes:
	Get-Process
	# List all the running processes where processname is ‘java’:
	Get-Process | where { $_.ProcessName –eq ‘java’ }
	# Get all the running processes where processname is ‘java’ and foreach over them calling kill on each of them:
	Get-Process | where { $_.ProcessName –eq ‘java’ } | foreach { kill $_ }
	# With shorthand aliases (ps is for get-process, ? Is for “where”, % is for “foreach”):
	ps | ? { $_.ProcessName –eq ‘java’ } | % { kill $_ }

view raw gistfile1.ps1 hosted with ❤ by GitHub

Line/Word Counting Files with Powershell

Line Counting a file

(gc ./myfile.txt | measure -line).Count

Word Counting a file

(gc ./myfile.txt | measure -word).Count

Character Counting a file

(gc ./myfile.txt | measure -char).Count

White Character Count for a file

(gc ./myfile.txt | % { [char[]]$_ | ? { $_ -match ‘[\s]’ } } | measure).Count

Black Character Count for a file

(gc ./myfile.txt | % { [char[]]$_ | ? { $_ -match ‘[\S]’ } } | measure).Count

Line counting many files (recurse from curdir) and getting the Sum

                (ls -recurse *.hl7 | % { (gc $_ | measure –line).Lines } | measure –sum).Sum

Line counting many files (recurse from curdir) and getting the Average

                (ls -recurse *.hl7 | % { (gc $_ | measure –line).Lines } | measure –average).Average

Count all lines containing “error” or “Error” in all log files from curdir down and getting the Sum

                (ls -recurse *.log | % { (gc $_ | ? {$_ -match ‘[Ee]rror’ } | measure –line).Lines } | measure –average).Sum

Restarting a service on a remote machine

If you have Windows Servers that you need to do any admin on, you should already have set them up with powershell and enable remoting.

If you need to restart a service from your own box, do not be a monkey and RDP into the machine and go to control panel, etc.

Open powershell on your own machine and type this:

icm SERVERNAME { net stop 'Service Name'; net start 'Service Name'; }

If you find yourself doing this a lot, open up your profile script at "~/Documents/WindowsPowerShell/Microsoft.PowerShell_profile.ps1"  (If it doesn't exist, make it) and define this as a function that you can easily remember:

function restart-jira() { icm SERVERNAME {  net stop 'Atlassian JIRA'; net start 'Atlassian JIRA'; }

Restart your shell (or reload profile script) and from now on you can just type e.g. "restart-jira" and it will restart the remote service.

A Better Console For Windows

Using Windows, but still crafty enough to use the shell?

Go get yourself ConsoleEmu.   Support for font changes, multi-shell support, tabs, and most importantly of all:  window resizing/maximizing. 

http://code.google.com/p/conemu-maximus5/

Make sure you set it up to use PowerShell as it will default to boring/shitty old cmd.

Tailing Log Files in Powershell

Want to watch a log file on a windows box and have the console window constantly updated as the file grows?  Open up powershell and type:

gc c:\somefile.log -wait

Want to watch a log file and only show lines that contain the word "Error?"

gc c:\somefile.log -wait | ? { $_.Contains("Error") }

Want to watch a log file and have it send you an email any time an error message occurs in the log file?


gc trace.log -wait | ? { $_.Contains("Error") } | % { Send-MailMessage -to "myinbox@wherever.com" -from "mysmtpinbox@wherever.com" -bodyAsHTML ("An error occurred: <br/><br/> + $_ } -smtpserver "smtp.myserver.com" }
Want to do the same with an SMTP server that requires authentication?


$username = "mysmtpinbox@wherever.com"
$password = ConvertTo-SecureString "mysmtppassword" -AsPlainText - Force
$creds = New-Object System.Management.Automation.PSCredential($username, $password)

gc trace.log -wait | ? { $_.Contains("Error") } | % { Send-MailMessage -to "myinbox@wherever.com" -from "mysmtpinbox@wherever.com" -bodyAsHTML ("An error occurred: <br/><br/> + $_ } -smtpserver "smtp.myserver.com" -credential $creds }

Sharing Files Over Http

If you want to share out a directory over HTTP, and you have python installed on your machine, run this at the command line to do so:

python -m SimpleHTTPServer 8080

Anyone on your network can now navigate to http://YOURHOST_OR_IP:8080/.  Obviously, if you want to share this out over the internet, you can setup port forwarding on your router and have them hit your public IP.