Removing blank lines

Question

I have a csv file in which every other line is blank. I have tried everything, nothing removes the lines. What should make it easier is that the the digits 44 appear in each valid line. Things I have tried:

grep -ir 44 file.csv
sed '/^$/d' <file.csv
cat -A file.csv
sed 's/^ *//; s/ *$//; /^$/d' <file.csv
egrep -v "^$" file.csv
awk 'NF' file.csv
grep '\S' file.csv
sed 's/^ *//; s/ *$//; /^$/d; /^\s*$/d' <file.csv
cat file.csv | tr -s \n

Decided I was imagining the blank lines, but import into Google Sheets and there they are still! Starting to question my sanity! Can anyone help?

Answer 1

sed -n -i '/44/p' file

-n means skip printing
-i inplace (overwrite same file)
- /44/p print lines where '44' exists

without '44' present

sed -i '/^\s*$/d' file

\s is matching whitespace, ^startofline, $endofline, d delete line