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i got this. But still i cant able to pass the variable.

sed -i '3,$/pattern/d' filename.txt

My requirement is:
Passing the pattern to variable a. file with $a (i.e) 12345 shoud delete all the...

I have a file with ~1000 lines.
I need to delete all the lines before a pattern by passing the pattern in to variable. how can i do that.

my file contains a pattern. passing it to variable as
...