符号链接会发生什么？原始二进制文件和符号二进制文件的行为不同

安装Basic TeX后，我发现这pdflatex只是一个符号链接，pdftex该链接在同一目录下。但是，当我尝试直接通过pdftex而不是通过编译我的tex文件时pdflatex，编译过程变得具有交互性，我需要return不断按下按钮，直到编译完成。但是，如果使用pdflatex，输出似乎会有所不同。pdftex当它被符号链接时会发生什么？符号链接可以更改执行行为的二进制文件吗？

更新：

pdftex的输出如下所示：

This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) (preloaded format=pdftex)
 restricted \write18 enabled.
entering extended mode
(./test.tex
! Undefined control sequence.
l.1 \documentclass
                  [letter]{article}
?
! Undefined control sequence.
l.2 \usepackage
               [margin=0.5in]{geometry}
?
! Undefined control sequence.
l.4 \begin
          {document}
?
! Undefined control sequence.
l.6 \section
            *{Problem 1}
?
! Undefined control sequence.
l.8 \subsection
               *{Algorithm}
?
[1{/usr/local/texlive/2015basic/texmf-var/fonts/map/pdftex/updmap/pdftex.map}]
)</usr/local/texlive/2015basic/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.
pfb>
Output written on test.pdf (1 page, 15945 bytes).
Transcript written on test.log.

并且，pdflatex打印此：

his is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) (preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
(./test.tex
LaTeX2e <2015/01/01>
Babel <3.9l> and hyphenation patterns for 21 languages loaded.
(/usr/local/texlive/2015basic/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/local/texlive/2015basic/texmf-dist/tex/latex/base/size10.clo))
(/usr/local/texlive/2015basic/texmf-dist/tex/latex/geometry/geometry.sty
(/usr/local/texlive/2015basic/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/local/texlive/2015basic/texmf-dist/tex/generic/oberdiek/ifpdf.sty)
(/usr/local/texlive/2015basic/texmf-dist/tex/generic/oberdiek/ifvtex.sty)
(/usr/local/texlive/2015basic/texmf-dist/tex/generic/ifxetex/ifxetex.sty))

LaTeX Warning: Unused global option(s):
    [letter].

(./test.aux)
*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
[1{/usr/local/texlive/2015basic/texmf-var/fonts/map/pdftex/updmap/pdftex.map}]
(./test.aux) )</usr/local/texlive/2015basic/texmf-dist/fonts/type1/public/amsfo
nts/cm/cmbx12.pfb></usr/local/texlive/2015basic/texmf-dist/fonts/type1/public/a
msfonts/cm/cmr10.pfb>
Output written on test.pdf (1 page, 21292 bytes).
Transcript written on test.log.