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The FMA is installable from universe pocket since Ubuntu 19.04 (disco dingo, now EOL) and then on supported 20.04 LTS (focal fossa) with the command:
sudo apt-get install filemanager-actions
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Run
fma-config-tool
from your teminal to open FileManager-Actions Configuration Tool -
Define a new action, under Action tab, Add your context label, for example "Open in Deepin"
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Under command tab, add the path of the cmd, for example "/usr/bin/deepin-terminal"
NOTE: To find path of the program, type which deepin-terminal
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Click on Edit your preferences on the top bar, uncheck "create a root "FileManager-Actions" menu and the next option
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Save and it should appear on your file manager context menu