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Perhaps you need to show a bigger example of your input data?
$ echo "<h1> linux </h1>"
<h1> linux </h1>

$ echo "<h1> linux </h1>" | sed "s/linux/Linux/"
<h1> Linux </h1>

Why sed?


$> echo "<h1> linux </h1>"| awk '{$2=toupper($2); print}'
<h1> LINUX </h1>

Do you need all letters uppercase or just the first one? If you can settle for just the first one, this will work: sed 's/<h1> \(.*\) <\/h1>/\u\1/'

May require GNU sed (if wanting to use \u switch)

So very nearly ;) try the following:

echo '<h1> linux </h1>' | sed 's/\(<h1>\) *\([a-z]*\) \(<\/h1>\)/\1 \U\2\E \3/'
The \U uppercases the remaining text until it encounters a \L (lowercase...