[Tex/LaTex] Capitalizing only the first word of the sentence in Section,Subsection

capitalizationsectioning

I am using the book class and I wrote all the parts, sections, subsections as
\section{My Section Is Like This}
that I produce something like this

My Section Is Like This

My editor asked to write something like this:

My section is like this

I believe that I have to introduce a command like the one in capitalising-first-letter-of-each-word-in-section-headings-using-book-class:

\let\svsection\section
\def\section#1{\svsection{\titlecap{#1}}}

that does not solve my problem

or

something like that 

\sectionfont{\scshape\MakeTextLowercase}

that produces

my section is like this

The problem is how to capitalize only the first letter of the sentence for all sections, subsections, subsubsections, but I have not been able to find it.

Best Answer

Rather than complicate your macros forever I'd just edit the file.

if your sec.tex file is

\section{My Title}
.....

\section{With Title Case}

...

Then after a command such as

sed -ie "s/\\\\section{\(.\)\([^{}]*\)}/\\\\section{\\1\\L\\2}/"  sec.tex

then it will be

\section{My title}
.....

\section{With title case}

...

I used sed on the commandline there but any editor should be able to do similar replacements.

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