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The problem is I need to skip or delete all the lines between the two keywords in a file and the keyword pair will appear many times in the file.The file looks something like this

.
.
..........
..........
Hello world
..........
..........
welcome
.
.
.
..........
..........
Hello world
..........
..........
welcome
.
.
.
.........
.........
Hello world
..........
..........
welcome
.
.
.
..........
..........

Here the contents between Hello world and welcome are to be deleted (including those keywords). Please help me out with this.

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    \$\begingroup\$ Welcome to PPCG! Please note that this site is for challenges, not general questions on programming. You may want to ask your question on stackoverflow instead. \$\endgroup\$ Commented Apr 30, 2017 at 9:31

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