I've installed a backported version of TL2012 on Ubuntu 12.04, and every time I start pdftex, xetex, luatex, pdflatex, xelatex, or lualatex, I get the statement
restricted \write18 enabled. entering extended mode. I don't recall seeing this in Miktex so I wonder whether I did something wrong during the installation. Interestingly, I don't get the message when I run
First of all, what does it mean? Second, is it a normal message for Tex Live (2012)? Finally, if it is an error, how can I fix it?