tlmgr-option
TeX Live settings manager. tldr-pages
On several platforms
Several platforms
List all TeX Live settings
tlmgr option showallIdentifyList all currently set Tex Live settings
tlmgr option showIdentifyPrint all TeX Live settings in JSON format
tlmgr option showall --jsonIdentifyShow the value of a specific TeX Live setting
tlmgr option settingIdentifyModify the value of a specific TeX Live setting
tlmgr option setting valueIdentifySet TeX Live to get future updates from the internet after installing from DVD
tlmgr option repository https://mirror.ctan.org/systems/texlive/tlnetIdentify