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IMHO:

$(wc -l < infile)

linecnt=$( cat myfile.html | wc -l ) # not a UUOC because we want one result
if [ $linecnt - gt 4 ] ; then
# do something
fi

You might h, remove the newline, validate, g? Validate a copy without the newline? Not sure the problem. To get \n into the buffer in the first place, you need a loop if not </h2> then N.


sed '...