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Overview

fbcat takes a screenshot using the Linux framebuffer device. Two executables are provided:

  • Low-level fbcat that operates on the current virtual terminal and writes the screenshot to stdout in the PPM format:

    $ fbcat > screenshot.ppm
    $ file screenshot.ppm
    screenshot.ppm: Netpbm image data, size = 1280 x 1024, rawbits, pixmap
  • High-level fbgrab that supports the PNG format and virtual terminal switching:

    $ fbgrab '-?'
    Usage: fbgrab [option...] <filename.png|->
    
    Options:
    -c <N>      grab from /dev/ttyN
    -C <N>      grab from /dev/ttyN, for slower devices
    -d <dev>    use framebuffer device <dev>
    -i          turn on PNG interlacing
    -s <N>      sleep <N> seconds before making screenshot
    -?          display this help and exit
    
    If the specified destination is "-", the PNG output is piped to stdout.

See the manual pages for details.

The following visuals are supported:

  • TRUECOLOR
  • DIRECTCOLOR
  • PSEUDOCOLOR
  • STATIC_PSEUDOCOLOR
  • MONO01
  • MONO10

Prerequisites

The following software is needed to build fbcat:

  • C compiler
  • Linux kernel userspace headers
  • GNU make

Additionally, the following software is needed to rebuild the manual pages from source:

fbgrab requires the following software:

Installation

To install system-wide:

$ make
$ sudo make install

The default installation prefix is /usr/local. You can specify different one using the PREFIX variable, e.g.:

$ make install PREFIX="$HOME/.local"