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Yes, but the original problem was: read a lot (~700k) files and extract only a certain part of line 3. Shell expansion can extract that part but it is not easy to interrupt the reading process after...

By replacing a line with a certain number of hyphens with a word i can easily parse. Like, in the following (simplified, just proof-of-concept) example:

sed -n 's/^x$/one/p
...

This is not a complete solution, just a detail for one:

Despite the preference of the majority here for awk i suppose that sed is the fastest to search for something at exactly line 3:

sed -n...