Some strange errors when moving from MikTex on windows to Ubuntu TeX.

Question

I have some tex code that I used to compile successfully (actually, with some 3 non-important warnings) on Windows using MikTex. When I try to compile it on Ubuntu using:

tex composition-body.tex

I get the following errors:

rafid@MyLaptop:~/Desktop/Composition$ tex composition-body.tex 
This is TeX, Version 3.1415926 (TeX Live 2009/Debian)
(./composition-body.tex
! Undefined control sequence.
l.6 \title
          {SOME TITLE}
? 
! Undefined control sequence.
l.10 \author
            {SOME AUTHOR}

? 
! Undefined control sequence.
l.40 \begin
           {document}
? 
! Undefined control sequence.
l.42 \maketitle

? 

Any idea why is that happening? By the way, I had to press "Enter" after every error for the compile to proceed!

Just in case you need this, I am using the EuroGraphics template: http://www.eg.org/EG/Publications/guidelines

UPDATE: I tried what was proposed by Lian, and now I am getting these errors:

rafid@MyLaptop:~/Desktop/Composition$ pdflatex composition-body.tex 
This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian)
 restricted \write18 enabled.
entering extended mode
(./composition-body.tex
LaTeX2e <2009/09/24>
Babel <v3.8l> and hyphenation patterns for english, usenglishmax, dumylang, noh
yphenation, loaded.
(./composition-body.aux)

! LaTeX Error: The font size command \normalsize is not defined:
           there is probably something wrong with the class file.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.40 \begin{document}

? 
! Undefined control sequence.
l.42 \maketitle

? 

! LaTeX Error: Environment abstract undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.44 \begin{abstract}

? 

! LaTeX Error: Environment classification undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.59 \begin{classification}
                        % according to http://www.acm.org/class/1998/
? 

Answer 1

It seem that you're running LaTeX on a document which should be included. Run LaTeX on the main document instead.

On MiKTeX perhaps your editor used the main document automatically (project setting).

When I read the file name composition-body.tex it reads like a part but not the main document. Typeset the main or frame document which uses \include or \input to read in composition-body.tex.

I had a look at the your linked template. There's a file EGauthorGuidelines-body.inc which contains title, author, abstract, \begin{classification}... just like your body file. But this file is not compilable, even if you rename it to get the extension .tex. Instead, EGauthorGuidelines-cgf-fin.tex has to be compiled. This file uses \input{EGauthorGuidelines-body.inc} to include the body file.

Answer 2

Try running

latex composition-body.tex or pdflatex composition-body.tex

instead of plain tex, which won't recognise LaTeX commands such as \title etc.