TLDR
Enter a command. For example: security, shortcuts, md5, universalaccessd.

qlmanage

 
QuickLook server tool. More information: https://ss64.com/osx/qlmanage.html.
 
  • Display QuickLook for one or multiple files:
     
    qlmanage -p {{filename}} {{filename2}}
     
  • Compute 300px wide PNG thumbnails of all JPEGs in the current directory and put them in a directory:
     
    qlmanage {{*.jpg}} -t -s {{300}} {{path/to/directory}}
     
  • Reset QuickLook:
     
    qlmanage -r

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