你看李敖的兒子
就一副台男鳥樣
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118 4. you have to do this in return
119 5. check your sed space if it can del real empty lines
120 cat tmp2.txt |sed '/^[[:space:]]*$/d'
121 yes. this way did remove real empty lines
122 6. if you backup diff log, then you replace the former empty lines with
123 real empty lines
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