Bash script to titlecase chapter titles in UPPERCASE

2titlecase

for filename in chapter-*.xhtml; do
    new12=$(sed -n '12p' "$filename" | cut -b 8- | se titlecase -n)
    sed -i -e '12s#^\(.*<p>\).*#'"\1$new12"'#g' "$filename"
    ## Uncomment next line to echo new title line to terminal for checking
    # sed -n '12p' "$filename"
  done

COMMENTARY - This assumes:

• the title is in line 12 of the file, in <p>...</p> delimiters
• the title itself begins at "column" 8 (i.e., immediately after the opening <?> tag; h3 would begin at 9-)
• it assumes *nix sed regex (tested on Ubuntu); might need adjusting for MacOS
• convenient checking of results available by uncommenting line 5.

Test data can conveniently be found in this Github repo/commit (ZIP can be downloaded; contains 75 chapters with uppercase titles).

---

For "post semantics", then this variation "works": it identifiles the line with the epub:type="title" semantic, and does the titlecase replacement on that line:

for filename in chapter-*.xhtml; do
    tctitle=$(sed -n 's/.*title\">\(.*\)/\1/p' "$filename" | se titlecase -n)
    sed -i -e 's#^\(.*title\">\).*#'"\1$tctitle"'#g' "$filename"
  done

Also, with titles on separate lines of a text file, this will work:

while read line; do
    se titlecase "$line"
done < titles.txt

Sample line from titles.txt =
input: A Title Of A Story | output: A Title of a Story

HT: Superuser

This doesn't change case: it takes the filename, truncates the extension, saves that string as variable, and does a search/replace with sed. E.g., for short story file: make the id="..." to id=~~ to make delimiting search easier:

ls | while read filename; do
full="${filename}"
id="${full%.*}"
  sed -i "s/~~/$id/g" ${filename}
done;

(The dquo deliimiters with sed are required for variable replacement in bash.)