fmtutil
Manage TeX formats and Metafont bases. tldr-pages
On several platforms
Several platforms
Recreate all format files
fmtutil --allIdentifyCreate all missing format files
fmtutil --missingIdentifyList available format configurations
fmtutil --listcfgIdentifyRecreate formats built with a specific engine
fmtutil --byengine engineIdentifyRecreate a specific format
fmtutil --byfmt formatIdentifyRecreate all system format files
fmtutil --sys --allIdentifyRecreate all user format files
fmtutil --user --allIdentify