qlmanage

QuickLook server tool. More information: https://keith.github.io/xcode-man-pages/qlmanage.1.html.

• Display QuickLook for one or multiple files:

qlmanage -p path/to/file1 path/to/file2 ...

• 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