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mike-seger/delete-leading-trailing-empty-lines.md

Last active March 6, 2025 07:23
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delete-leading-trailing-empty-lines.md

recipees

Method 1: Using sed

sed -i ':a;/^\n*$/{N;ba};/\n/{:b;/\n$/!{N;bb};s/^\n*//;s/\n*$//}' filename

Method 2: Using awk

awk '{if (NF || !blank) {print; blank=0} else if (!blank) {blank=1}}' filename > temp && mv temp filename

Method 3: Using perl

perl -i -0777 -pe 's/^\n+|\n+$//g' filename

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