What’s actually slowing this PC down?
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Use the command that matches your Linux display session: run scrot screenshot.png or ImageMagick’s import -window root screenshot.png on X11; run grim screenshot.png on a Wayland compositor that supports the screencopy protocol. For an interactive Wayland region, use grim -g "$(slurp)" screenshot.png. Bash is only launching the utility—the display server, compositor, and installed dependencies determine whether capture works.
Check whether the session is X11 or Wayland
Before choosing a command, identify the graphical protocol. In Bash, run:
echo "$XDG_SESSION_TYPE"The usual result is x11 or wayland. If the variable is empty or reports something unexpected, inspect your desktop login session and test the utilities’ help output. A remote shell, a container, or a shell without access to the graphical session may also lack the display environment required for capture.
- X11: use X11-aware tools such as scrot or ImageMagick import.
- Wayland: use a compositor and tool path that exposes the required screencopy protocol; grim is the direct command-line option documented for that workflow.
- Desktop tools: GNOME Screenshot and KDE Spectacle have their own command-line interfaces, but exact flags depend on the installed version.
Wayland screenshots with grim
Grim’s manual documents PNG output by default, standard-output support, geometry selection, output selection, and cursor options. Its compositor requirement is important: grim currently needs screencopy support, so the command is not guaranteed on every Wayland desktop.
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Capture the whole desktop to a PNG
grim screenshot.pngThis writes a file named screenshot.png in the current directory. Use an absolute or expanded path when a script may run from an unknown working directory:
grim "$HOME/Pictures/desktop-$(date +%Y%m%d-%H%M%S).png"Capture all outputs using grim’s default handling
grimWhen no filename is supplied, grim follows its default output handling. Check the installed manual with grim --help or man grim if you need to confirm where your distribution sends that output.
Select a region interactively
Install slurp separately, then run:
grim -g "$(slurp)" screenshot.pngslurp draws the selection interface and returns rectangle coordinates; grim captures that rectangle. Both programs must be installed, and the compositor must support the required path. Pressing Escape in the selector normally cancels the command, so a script should handle a non-zero exit status:
set -e
geometry="$(slurp)" || exit 1
grim -g "$geometry" screenshot.pngCapture an image to standard output or the clipboard
Grim uses - for image data on standard output:
grim - > screenshot.pngFor a Wayland clipboard, install the separate wl-copy utility and pipe the image:
grim - | wl-copySaving a file and copying an image are different workflows. A clipboard command may appear to do nothing if no Wayland clipboard provider is available or if the shell is not connected to the active desktop session.
Output, cursor, and geometry options
Run grim --help and read the local manual for the exact option spelling in your package. The documented option set includes choosing an output, including the pointer, and supplying a rectangle in layout coordinates. Keep the command and destination explicit in automation so a change in monitor arrangement does not silently capture the wrong area.
X11 screenshots with scrot
Scrot’s Debian manual describes it as a scriptable command-line capture utility that can save multiple image formats and capture a window or rectangle.
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Capture the full X11 screen
scrot screenshot.pngUse a shell-generated filename for repeatable jobs:
mkdir -p "$HOME/Pictures"
scrot "$HOME/Pictures/x11-$(date +%Y%m%d-%H%M%S).png"Window and region capture
Scrot supports selecting a specific window or rectangle; its flags vary by release. Start with scrot --help or man scrot and use the syntax installed on your system rather than copying a flag from an unrelated version. This avoids confusing an X11 window identifier with a Wayland surface, which cannot be assumed to be interchangeable.
ImageMagick import on X11
ImageMagick’s Import documentation shows capture of some or all of an X server screen. The commonly used root-window command is:
import -window root screenshot.pngOn installations where ImageMagick uses the magick launcher, the equivalent form may be:
magick import -window root screenshot.pngCommand names differ between ImageMagick versions and distributions. If one form is not recognized, run import -help or magick import -help. These commands target an X server; they are not a general native-Wayland solution.
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GNOME Screenshot
The gnome-screenshot manual documents full-screen, active-window, area, clipboard, delay, and output-file modes. Because option spelling and availability can change with the installed package, begin with:
gnome-screenshot --help
man gnome-screenshotUse the displayed option for your required target (whole screen, active window, or selected area), then provide an output filename if the help text supports it.
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KDE Spectacle
KDE’s Spectacle documentation explains starting the application from the command line. Background mode, output-file, and capture-mode flags depend on the installed KDE Frameworks version, so check:
spectacle --helpSpectacle can be useful when your KDE session exposes capture behavior that a generic utility does not, but do not assume GNOME and KDE flags are interchangeable.
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Fail clearly and create the destination directory
#!/usr/bin/env bash
set -Eeuo pipefail
out_dir="${1:-$HOME/Pictures/screenshots}"
mkdir -p -- "$out_dir"
case "${XDG_SESSION_TYPE:-}" in
wayland)
command -v grim >/dev/null || { echo "grim is required" >&2; exit 127; }
output="$out_dir/wayland-$(date +%Y%m%d-%H%M%S).png"
grim "$output"
;;
x11)
command -v scrot >/dev/null || { echo "scrot is required" >&2; exit 127; }
output="$out_dir/x11-$(date +%Y%m%d-%H%M%S).png"
scrot "$output"
;;
*)
echo "Unsupported or unknown XDG_SESSION_TYPE" >&2
exit 2
;;
esac
printf 'Saved %sn' "$output"This script deliberately refuses to guess. If a Wayland compositor lacks screencopy support, installing scrot will not solve the protocol mismatch; if an X11 session lacks scrot, install it or substitute ImageMagick after checking its help.
Check the result and preserve exit status
if [[ ! -s "$output" ]]; then
echo "Capture produced no data" >&2
exit 1
fi
file "$output"For pipelines, avoid hiding failures in a later command. set -o pipefail (included above through set -Eeuo pipefail) makes a failed grim invocation fail the pipeline rather than reporting only the clipboard command’s status.
Common failures and fixes
“Cannot open display” or an empty display variable
The shell may not be attached to the graphical login, especially over SSH, through sudo, or inside a service. Run the command in a terminal within the desktop session. On X11, verify that DISPLAY is set; on Wayland, verify that WAYLAND_DISPLAY and the session’s runtime directory are available. Do not copy those values from another user’s session without understanding the security implications.
Grim reports missing screencopy support
This is a compositor capability issue, not a filename problem. Check grim --help, your compositor documentation, and distribution packages. A desktop-specific tool such as GNOME Screenshot or Spectacle may use a different portal path. A community report illustrates that Wayland behavior can vary by configuration; it does not establish a limitation for every GNOME setup: GNOME Discourse discussion.
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Install slurp separately from grim and test it by itself. If Escape cancels selection, do not pass an empty geometry to grim. A selector may also fail when the compositor does not expose the needed interfaces.
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The screenshot is black, partial, or from the wrong monitor
Confirm the session type, monitor layout, and whether you requested an output or a layout rectangle. X11 tools cannot be expected to understand native Wayland surfaces. For multi-monitor Wayland capture, consult grim’s local manual for output selection and coordinate behavior.
The command works interactively but not from cron or a service
Scheduled jobs usually lack the desktop environment, authentication, runtime directory, and display variables. Run the capture from a user-level desktop service with the required environment, or pass a deliberate environment only when you understand the session’s permissions. A system service should not blindly capture a user’s display.
ImageMagick’s import command is unknown
Try the launcher form documented by your package: import -help or magick import -help. Install ImageMagick’s import component if your distribution packages it separately.
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Performance, privacy, and file-management considerations
Desktop capture is normally fast, but full multi-monitor images are larger than a single window or region. PNG preserves exact pixels and is convenient for documentation; choose another format only when the installed tool and your workflow support it. Timestamped names prevent accidental overwrites, while mkdir -p makes scripts repeatable.
Remember that screenshots can contain passwords, tokens, private messages, and customer data. Restrict output-directory permissions, avoid sending captures to world-readable locations, and remove temporary files when a script no longer needs them. Clipboard contents may remain available to other applications until replaced.
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A wrapper such as gscreenshot documents several X11 and Wayland backends. It can reduce command differences, but its functionality and dependencies still vary by configuration, so inspect its README and local help before relying on it in automation. The archived grim repository points development to SourceHut; its examples remain useful, while your distribution’s current manual is the better reference for installed flags.
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If your goal is a screenshot of a website rather than the local desktop, ScreenshotNeo returns a PNG, JPEG, WebP, or PDF from one GET request. Its API accepts the page URL and can wait for content, load lazy images, select an element, set a viewport or device preset, apply custom CSS or JavaScript, block resources, and use cookies or headers. Before capture it accepts consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be disabled.
Only clean shots are billed. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and the response identifies the result with X-Page-Verdict and X-Billed headers. ScreenshotNeo also provides an MCP server with take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients.
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See the ScreenshotNeo API documentation for all options. A direct cURL capture is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpYou get 1,000 screenshots per month free with no card. Paid plans start at $5 for 3,000 shots; every feature is included on every plan. Create a free ScreenshotNeo account.
Quick decision checklist
- Is
$XDG_SESSION_TYPEx11orwayland? - For X11, is scrot or ImageMagick installed and able to open the display?
- For Wayland, does the compositor support screencopy, and are grim and (for regions) slurp installed?
- Do you need a file, standard output, or a clipboard image?
- Will the script run inside the active desktop session rather than cron or an unrelated service?
- Does the destination protect sensitive screenshot content?
Frequently Asked Questions
Can scrot capture a native Wayland desktop?
No. Scrot targets an X server. Use grim when the Wayland compositor supports screencopy, or use a desktop-specific portal tool.
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Is slurp included with grim?
No. Slurp is a separate region-selection utility used by the demonstrated grim command.
How do I put a grim screenshot on the clipboard?
Run grim - | wl-copy; wl-copy must be installed and available in the active Wayland session.
Why does a command-line screenshot work in a terminal but fail in cron?
Cron generally lacks the desktop display variables, runtime directory, and permissions available to an interactive graphical session.
Quick Recap
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