System Tips

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4 System Title
Keywords		 Keyboard Steps Posted Date
Android Pdf Cache Problem
cache pdf
clear the PDF cache in Google Chrome on Android
To clear the PDF cache in Google Chrome on Android, you need to delete your general cached images and files or use device storage settings to wipe Chrome's app cache. [1, 2, 3]

Method 1: Delete Cached Files via Chrome Settings
  1. Open the Chrome app on your Android device.
  2. Tap the three-dot menu in the top right corner.
  3. Select History Clear browsing data.
  4. Set the Time range to All time (or the period when you viewed the PDF).
  5. Check the box for Cached images and files. (Make sure to uncheck other options like browsing history or passwords if you want to keep them.)
  6. Tap Clear data. [1]


Method 2: Force Clear Chrome App Cache

If the PDF is still stubbornly displaying an old version, wipe the app data directly from your device settings. 2]
  1. Go to your Android Settings.
  2. Tap Apps See all apps (or Manage Apps).
  3. Find and tap Chrome.
  4. Select Storage & Cache.
  5. Tap Clear cache
 06/13/2026
Windows Command Prompt Actions
cmd clipboard internet network repair troubleshoot performance ram ultimate slow *		 in "Search" type "cmd" -> Run as administrator

assocFile opens wrong application.
assoc

ftypeShows what programs open what file types
ftype
  • shows application path}

    • chkdskHard drive doing the weird check out you drive
    chkdsk /f> Checks for file system errors.
    chkdsk /f /r Checks for file system errors and repairs. You will reboot if you do the boot drive.

    cipher Are deleted files are actually gone? Securely write over empty space on your drive.
    cipher /w:c:

    cleanmgrDisk Cleanup - Free up space on C: drive
    cleanmgr

    *DISMwin 11 - Need a deeper scan tool
    DISM /Online /Cleanup-Image /Restore Health Deep repair tools
    AND
    DISM /Online /Cleanup-Image /startcomponentcleanup

    Part 2 win 11


    Windows has kept a backup of every single updated ever installed. And nobody ever deletes them,
    • search CMD
    • click command prompt, it run his administrator and type "DISM /online/cleanup-image/analyzecomponentstore".
    • Look at the line that says backups and disabled feature. Because that number is pure dead weight. Sitting on your C: drive if it says cleanup, recommended. Yes,
    • run the same command again. But end it with start component cleanup "DISM /online/cleanup-image/startcomponentcleanup". Instead and windows deletes the lot.
    Microsoft has been stacking those up since the day you installed windows and never told you.

    driverquery Show every driver and when it was installed. Drivers:
    driverquery Using the "/v" extension will download the ones you do not have
    then
    driverquery /SI confirms that all drivers are installed and ready

    getmac Get MAC address
    getmac Shows MAC address of local + remote machines

    gpresult See your group policies! Shows every Group Policy applied to user and computer
    gpresult /r

    gpupdate For admins: group policy update
    gpupdate /force Force Group Police update

    ipconfig Show my DNS cache
    ipconfig /displaydnsShows DNS cache

    netsh Is windows throttling your internet?
    netsh interface tcp set global autotuning=high

    See your wifi profiles. Shows all WiFi networks previous joined
    netsh wlan show profiles |clip

    Forgot your wifi password. Shows specific wifi network password in the clear
    netsh wlan show profiles name=yourwifi key=clear

    netstat Is your app on internet? Shows which apps are talking to the internet and which ports they?re using.
    netstat -abno |clip

    What application is using what port
    netstat -ano Shows ports + process IDs
    Description: apps talking to the internet right now. There's one command that shows every connection open on your machine, including the ones you never made type "netstat -ano" you'll get the full list. Every address your pc is talking to and the process ID doing the talking. Most of it is normal. Your browser windows, update your game. What you're looking for is anything established that you can't explain. Take the number on the far right open task manager, go to details and find that ID now. You know exactly which program is talking to? The internet behind your back windows has shipped this for 20 years and never put it anywhere. You'd find it, do this right now and follow for more tips like this something.

    net use For admins: silently access network users C drive
    net use //computer/C$
  • Use reverse slash}

    • net user User profiles that are configured Shows all users
    net user

    Change password on user.
    net user existingUserName NewPassword The selected user will have his password updated.

    perfmonWindows reliability monitor - your computers problem history
  • graphical}
    perfmon /rel

    • *powercfgCheck battery on laptop
    powercfg /batteryreport Creates battery health report

    Unlock Ultimate Power Plan. Search "power plan" to see what you are currently using
    powercfg -duplicatescheme e9a42b02-d5df-448d-aa00-03f14749eb61 Adds another performance item "Ultimate"

    I disabled this Windows 11 feature and instantly reclaimed almost 25GB of storage. I'm talking about hibernation, which is useful if you want your PC to preserve everything you're doing without putting it in sleep mode. I can see myself using it on a laptop, where that extra bit of battery life can make a difference, but I don't really see the point on a desktop. I'm usually in front of my PC for most of the day, and when I'm away from the keyboard, the monitors turn off automatically after a few minutes. And once I'm done for the day, I just shut it down. So giving this feature up was a no-brainer, especially when I can always use sleep mode.

    Hibernation taking up way too much space

    Having 64GB of RAM only made it worse
    Hibernate confirmation on Windows 11 desktop.
    Before I dig into the details, let me explain how hibernation works and how it differs from sleep mode. When you put your PC into sleep mode, Windows keeps everything you're doing in RAM while the rest of the system enters a low-power state. Hibernation, on the other hand, saves that data from RAM to system storage before powering down your PC. So when you turn it back on, whether that's hours or days later, you can pick up where you left off without your PC continuously drawing power in the meantime.

    Yes, your PC still uses a tiny amount of standby power while it's hibernating, but it's barely anything compared to sleep mode. Windows stores this data in a file called hiberfil.sys, and its size depends on how much RAM you have. By default, this file takes up roughly 40% of your RAM, which matches the 25GB of space I freed up on my PC with 64GB of RAM. If you have 32GB of RAM, you can expect to free up a little over 12GB by disabling hibernation, whereas that number drops to 6GB if you only have 16GB.

    Disabling hibernation takes one simple command. You get back all that space instantly

    The good news is that you don't have to dig through the Windows Registry and mess around with a bunch of keys to delete the hiberfil.sys file. All you need to do is open Command Prompt as an administrator, type in the following command, and hit Enter:

    powercfg /hibernate off
    That's pretty much it. If you go to Settings -> System -> Storage on Windows, you may not see the updated space right away because Windows just rounds the number there. However, you can double-check the exact free space before and after you disable hibernation by using the command fsutil volume diskfree C:.

    Look for Total free bytes and compare the number before and after you turn off hibernation. This is how I confirmed that I had actually gotten back a little over 25GB of storage space. You can confirm that hibernation is disabled by going to Control Panel -> Hardware and Sound -> Change what the power buttons do and opening the dropdown. You won't find Hibernate along with Shut down and Sleep. But if you ever change your mind, simply use the command powercfg /hibernate on and Windows will recreate the hiberfil.sys file and take up that space again.

    If I were using a laptop, I probably would leave this feature untouched. But on a desktop, that 25GB of space could go towards important files, another small gang, screen recordings, or pretty much anything else I'd get more use out of. Sure, that isn't a huge amount when you have a 2TB SSD, but when a feature I don't even bother with takes it up, I'd rather have it back. And it's not like I'm giving this feature up for good because one command is all it takes to get the file back.

    Wake Timers

    Your PC has been turning itself on at night and windows knows exactly what did it? Something set a wait timer and it's usually one of windows's own scheduled tasks. Waking your machine at 3 in the morning.
    • right click window on task bar.
    • click command prompt hit, run his administrator
    • type powercfg /lastwake

    This names the exact process that woke your pc in plain English that comes back empty run powercfg /waketimers, and you'll see what's cued to do it tonight. Windows schedules that the whole time and never told you this right now.

    sfcWindows depends on thousands of system files to function properly, and any of them can become corrupted due to bad updates, sudden shutdowns, or even malware. When that happens, you get vague symptoms such as apps crashing for no reason, Windows features stopping, or missing DLL errors.

    The System File Checker (SFC) scans every protected system file on your machine and compares it against a cached copy. If something doesn't match, it automatically replaces the corrupted file. To run it, open Command Prompt as administrator, type sfc /scannow, and press Enter. The scan usually takes 10 to 15 minutes and needs no input from you once it starts.
    sfc /scannow Repairs corrupt system files

    Once it finishes, SFC reports one of three outcomes. It either shows no integrity violations found, corrupt files found and repaired, or corrupt files found, but not all could be fixed. If you get the third result, run DISM /Online /Cleanup-Image /RestoreHealth first. This pulls fresh copies of files from Windows Update, then run sfc /scannow again. It should succeed this time

    shutdownComputer screwy Restarts PC directly into recovery menu.
    shutdown /r /o

    Force Windows shutdown
    shutdown /s /t 0 Force shutdown immediately (works remotely)

    Force Windows shutdown
  • IT gold}
    shutdown /i Graphical remote shutdown manager (IT Gold)

    • systeminfo Get system info
    systeminfo /fo list
    Shows just the OS information ? filtered, clean, perfect for screenshots.
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    systeminfo|findstr /B /C:?OS?

    • tasklist Got a resource hog. Shows how much resource an application is consuming.
    tasklist /fi ?imagename eq msedge.exe
  • Run ftype to get app names}

    Replace task mangager detective work
    tasklist /svc Shows what services and processes are running

    • taskkill/Kill frozen app and restart
    taskkill /f /im explorer.exe & start explorer.exe Restart Windows Explorer example

    whoami Who am I?
    whoami /groups |clip Shows AD groups you?re in

    wingetWindows 10 & up

    Multiple installs

    Right now you open a browser and hunt down 5 download links, then you click through 5 installers and untake the toolbar. Windows has had an App Store in the command line. This whole time, little install dot app tick every app you want. Chrome, steam discord, Spotify VLC. It writes the whole command for you. Copy it, open command prom. Haste, it hit enter all of them. Install it once straight from the official source. No bundle, junk, no next next. That command is just winget install with the app Ids behind it. So once you know you're 5, you can type it from memory forever send this to whoever setting up a new PC. One command installs every app on a new PC.

    Update all applications. Updates all apps on your system, replacing chocolatey or manual updating
    winget upgrade ?all

    winsat mem It is time to test your ram chips
    winsat mem

    wmic Quick health check - Health check on hard drives or SSDs Reports OK if worky
    wmic diskdrive get status

    List of apps intalled on my system
    wmic product get name

    		 01/03/2026
    Windows Comand Prompt To Clipboard Using The "|clip"
    command clipboard powershell    		 clipboard is activated when the pipe symbol + clip is used. The output will not go to the screen

    Loading command prompt Output to clipboard using pipe. example: ipconfig /all |clip
    paste into document by ctrl V Notepad text dump    		 01/03/2026
    Windows View Your Pc
    crashes stability *
    *Crashes win 8+
    Windows tracks every crash your PC ever had, and never told you. It tracks every freeze, every app that closed itself, and every failed update with the exact date and time.

    To access:
    • Press the windows key
    • type, reliability
    • open view, reliability history.
    Now look at this, that's a timeline of your pc's stability score day by day. Every red x is something that failed, click one, and it tells you exactly which app crashed and why. So, next time, your pc acts up, you don't guess, you just look. Do this right now. Video
    		 09/23/2026