Commands tagged PowerShell (12)

  • Efficiently clear all Windows Event log entries from within a Cygwin terminal. Uses "cygstart" to launch a hidden "PowerShell" session passing a Powershell command to loop through and clear all Windows Event Log entries. Very useful for troubleshooting and debugging. The command should in theory elevate you session if needed. One liner is based on the PowerShell command: wevtutil el | foreach { wevtutil cl $_ }

    cygstart --hide -wa runas powershell -WindowStyle Hidden -Command '"&{wevtutil el | foreach{wevtutil cl $_}}"'
    lowjax · 2015-02-15 22:56:20 25
  • Here's an annotated version of the command, using full-names instead of aliases. It is exactly equivalent to the short-hand version. # Recursively list all the files in the current directory. Get-ChildItem -Recurse | # Filter out the sub-directories themselves. Where-Object { return -not $_.PsIsContainer; } | # Group the resulting files by their extensions. Group-Object Extension | # Pluck the Name and Count properties of each group and define # a custom expression that calculates the average of the sizes # of the files in that group. # The back-tick is a line-continuation character. Select-Object ` Name, Count, @{ Name = 'Average'; Expression = { # Average the Length (sizes) of the files in the current group. return ($_.Group | Measure-Object -Average Length).Average; } } | # Format the results in a tabular view, automatically adjusted to # widths of the values in the columns. Format-Table -AutoSize ` @{ # Rename the Name property to something more sensible. Name = 'Extension'; Expression = { return $_.Name; } }, Count, @{ # Format the Average property to display KB instead of bytes # and use a formatting string to show it rounded to two decimals. Name = 'Average Size (KB)'; # The "1KB" is a built-in constant which is equal to 1024. Expression = { return $_.Average / 1KB }; FormatString = '{0:N2}' } Show Sample Output

    ls -r | ?{-not $_.psiscontainer} | group extension | select name, count, @{n='average'; e={($ | measure -a length).average}} | ft -a @{n='Extension'; e={$}}, count, @{n='Average Size (KB)'; e={$_.average/1kb}; f='{0:N2}'}
    brianpeiris · 2012-03-13 17:58:10 7
  • This command takes an application name as an argument and then it will listen to the tcp traffic and capture packets matching the process Id of the application. The output shows: local address / local port / Remote Address / Remote port / State / Owning Process ID Show Sample Output

    while(1 -eq 1 ) {Get-Process -Name *APPNAME* | Select-Object -ExpandProperty ID | ForEach-Object {Get-NetTCPConnection -OwningProcess $_} -ErrorAction SilentlyContinue }
    guillaume1306 · 2019-03-26 09:44:57 20

  • 1
    & 'C:\cwRsync_5.5.0_x86_Free\bin\rsync.exe' --force --ignore-errors --no-perms --chmod=ugo=rwX --checksum --delete --backup --backup-dir="_EVAC/$(Get-Date -Format "yyyy-MM-dd-HH-mm-ss")" --whole-file -a -v "//MyServer/MyFolder" "/cygdrive/c/Backup"
    pascalv · 2020-03-06 10:17:42 47
  • This is a powershell command that returns the leaf part of the current svn url Show Sample Output

    Split-Path -Leaf ([xml](svn info --xml)).info.entry.url
    SuperflyJon · 2015-01-06 13:44:20 4
  • IMPORTANT: You need Windows PowerShell to run this command - in your Windows Command Prompt, type powershell Create a log file of your Motorola Surfboard SB6141 downstream signal strengths. Uses the built-in curl to request signal strength data from your SB6141 cable modem. HTML page has the signal strength numbers for the 8 downstreams. Some HTML/DOM processing parses out the 8 values from the above page. The eight extracted signal strengths are then logged to a file. A small while-loop watches the clock & repeats the process every 10 seconds. Show Sample Output

    while(1){while((date -f ss)%10-gt0){sleep -m 300} echo "$(date -u %s) $((curl|%{$_ -replace '\D+\n',''})">>modemlog.txt;sleep 1;echo .}
    omap7777 · 2015-12-24 02:12:10 5
  • IMPORTANT: You need Windows PowerShell to run this command - in your Windows Command Prompt, type powershell Uses sajb to start a PowerShell background job that pings an IP host every 10 seconds. Any changes in the host's Up/Down state is time-stamped and logged to a file. Date/time stamps are logged in two formats: Unix and human-readable. A while(1) loop repeats the test every 10 seconds by using the sleep command. See the Sample Output for more detail. I use this command to log Up/Down events of my Motorola SB6141 cable modem ( To end the logging, close the PowerShell window or use the "exit" command. Show Sample Output

    sajb {$ip="";$old=0;while(1){$up=test-connection -quiet -count 1 $ip;if($up-ne$old){$s=(date -u %s).split('.')[0]+' '+(date -f s).replace('T',' ')+' '+$ip+' '+$(if($up){'Up'}else{'Down'});echo $s|out-file -a $home\ping.txt;$old=$up}sleep 10}}
    omap7777 · 2015-12-28 20:33:08 8
  • Unblock multiple windows files using Powershell. -Recurse is optional to apply to all directories recursively.

    dir c:\mydir -Recurse | Unblock-File
    Denhams · 2016-02-12 17:02:14 6
  • Removes the annoying filehistory filename default of adding a really long UTC time and date string to every single file. Non recursive so you will have to run this per directory.

    Get-ChildItem -Recurse | Where-Object { $_.Name -match " ?\(\d\d\d\d_\d\d_\d\d \d\d_\d\d_\d\d UTC\)" } | Rename-Item -NewName { $_.Name -replace " ?\(\d\d\d\d_\d\d_\d\d \d\d_\d\d_\d\d UTC\)", ""}
    JohnnyVegas · 2020-04-17 20:20:44 75
  • Lower PowerShell priority, so that to launch processes in the background and work normally with other applications Show Sample Output

    PS C:\Users\pascalv> Get-WmiObject Win32_process -filter 'name = "powershell.exe"' | Foreach-Object { $_.SetPriority(16384) }
    pascalv · 2022-06-16 14:53:28 203

  • 0
    gci -rec | Select-Object Mode, Name, CreationTime, LastAccessTime, LastWriteTime | ft -autosize
    swarzynski · 2022-12-07 13:24:42 20

  • -1
    gci -rec | %{ $_.lastWriteTime = ($_.lastAccessTime = ($_.creationTime = (get-date "2021-05-19T10:14:00"))) }
    swarzynski · 2022-01-12 08:08:40 203

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Find which service was used by which port number

convert unixtime to human-readable with awk
- convert unixtime to human-readable with awk - useful to read logfiles with unix-timestamps, f.e. squid-log: sudo tail -f /var/log/squid3/access.log | awk '{ print strftime("%c ", $1) $0; }

Recover cvs ": no such repository" error

Enable automatic typo correction for directory names

dd with progress bar and statistics to gzipped image

shell bash iterate number range with for loop
Bash's arithmetic evaluation.

check open ports without netstat or lsof

display an embeded help message from bash script header
With this one liner you can easily output a standard help message using the following convention: Usage: is the start marker Stop at the last #

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Backup files incremental with rsync to a NTFS-Partition
This will backup the _contents_ of /media/SOURCE to /media/TARGET where TARGET is formatted with ntfs. The --modify-window lets rsync ignore the less accurate timestamps of NTFS.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: