This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/Arch Linux) (preloaded format=latex 2019.4.26) 31 MAY 2019 17:55 entering extended mode restricted \write18 enabled. %&-line parsing enabled. **foo.tex (./foo.tex LaTeX2e <2018-12-01> (/usr/share/texmf-dist/tex/latex/base/article.cls Document Class: article 2018/09/03 v1.4i Standard LaTeX document class (/usr/share/texmf-dist/tex/latex/base/size10.clo File: size10.clo 2018/09/03 v1.4i Standard LaTeX file (size option) ) \c@part=\count80 \c@section=\count81 \c@subsection=\count82 \c@subsubsection=\count83 \c@paragraph=\count84 \c@subparagraph=\count85 \c@figure=\count86 \c@table=\count87 \abovecaptionskip=\skip41 \belowcaptionskip=\skip42 \bibindent=\dimen102 ) (./foo.aux) \openout1 = `foo.aux'. LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 2. LaTeX Font Info: ... okay on input line 2. ! Undefined control sequence. l.4 \foo The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. (./foo.aux) ) Here is how much of TeX's memory you used: 199 strings out of 492617 2074 string characters out of 6135203 59592 words of memory out of 5000000 4199 multiletter control sequences out of 15000+600000 3640 words of font info for 14 fonts, out of 8000000 for 9000 1141 hyphenation exceptions out of 8191 23i,1n,17p,127b,36s stack positions out of 5000i,500n,10000p,200000b,80000s No pages of output.