how to redirect entire pattern of lines from a file. grep, awk,sed etc.,

Question

$cat datafile

BlankLine
a Line start with "Cn:"
BlankLine

Want to direct these lines to a new file and remove it from current file. datafile contains plenty of lines.

Answer 1

sed可能会完成工作，

$ sed -e '/BlankLine/,/BlankLine/w newfile' -i -e '/BlankLine/,/BlankLine/d' datafile

简要说明，

1. '/BlankLine/,/BlankLine/w newfile'：搜索从'BlankLine'到另一'BlankLine'的行，并将其写入 newfile 。
2. -i -e '/BlankLine/,/BlankLine/d'：删除在数据文件中写入的行。