$ source /etc/environment $ sudo source /etc/environment [sudo] password for t: sudo: source: command not foundIt seems that a different shell than bash is run to execute source /etc/environment and that shell doesn't have source as builtin. But my and the root's default shells are both bash.$ echo $SHELL/bin/bashIf sudo indeeds uses a different shell, why is it? I saw slm's reply, but don't understand in my case.
 sudo: source: command not found
shell;sudo