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sed '$d' file
sed '/\.sh$/d' file
sed '/^$/d' file
sed '2d' file
sed '2,$d' file
sed '/^test/'d file
sed -i 's/book/books/g' file
echo sksksksksksk | sed 's/sk/SK/2g' skSKSKSKSKSK echo sksksksksksk | sed 's/sk/SK/3g' skskSKSKSKSK echo sksksksksksk | sed 's/sk/SK/4g' skskskSKSKSK
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