Установите пакет ImageMagick

yum install ImageMagick

Процесс установки:

Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirror.reconn.ru
 * extras: mirror.reconn.ru
 * updates: mirror.logol.ru
Resolving Dependencies
--> Running transaction check
---> Package ImageMagick.x86_64 0:6.7.8.9-16.el7_6 will be installed
--> Processing Dependency: libwmflite-0.2.so.7()(64bit) for package: ImageMagick-6.7.8.9-16.el7_6.x86_64
--> Running transaction check
---> Package libwmf-lite.x86_64 0:0.2.8.4-41.el7_1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package            Arch          Version                  Repository      Size
================================================================================
Installing:
 ImageMagick        x86_64        6.7.8.9-16.el7_6         updates        2.1 M
Installing for dependencies:
 libwmf-lite        x86_64        0.2.8.4-41.el7_1         base            66 k

Transaction Summary
================================================================================
Install  1 Package (+1 Dependent package)

Total download size: 2.2 M
Installed size: 7.8 M
Is this ok [y/d/N]: y
Downloading packages:
(1/2): libwmf-lite-0.2.8.4-41.el7_1.x86_64.rpm             |  66 kB   00:00
(2/2): ImageMagick-6.7.8.9-16.el7_6.x86_64.rpm             | 2.1 MB   00:00
--------------------------------------------------------------------------------
Total                                              5.0 MB/s | 2.2 MB  00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
  Installing : libwmf-lite-0.2.8.4-41.el7_1.x86_64                          1/2
  Installing : ImageMagick-6.7.8.9-16.el7_6.x86_64                          2/2
  Verifying  : ImageMagick-6.7.8.9-16.el7_6.x86_64                          1/2
  Verifying  : libwmf-lite-0.2.8.4-41.el7_1.x86_64                          2/2

Installed:
  ImageMagick.x86_64 0:6.7.8.9-16.el7_6

Dependency Installed:
  libwmf-lite.x86_64 0:0.2.8.4-41.el7_1

Complete!

Для того, чтобы сделать скриншот выполните следующие команды:

export DISPLAY=:1
/usr/bin/import -window root screenshot_`date +%Y-%m-%d_%H_%M_%S`.png

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