分别用sed awk perl grep 实现：
1 sed '/^$/d' input.txt > output.txt #output file: output.txt
2 sed -i '/^$/d' input.txt #output file: input.txt
3 awk 'NF > 0' input.txt > output.txt #output file: output.txt
4 perl -i.backup -n -e "print if /\S/" input.txt #output file: input.txt.backup
5 grep -v '^$' input.txt > output.txt #output file: output.txt
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