using sed in unix

Shell Programming and Scripting
1

I have a log file with over 500000 lines and I want to use sed command to filter through the file and delete the first 5000 lines.

I have tried

sed -e '1,5000d' fileA.

where d is delete but this does not work. Any ideas ?

Regards

dodo14 :o

2 
sed -e '1,5000d' fileA

will not delete the first 5000 lines from the file permanently.

Because, you are not redirecting the output to any file.

Do this.

sed -e '1,5000d' fileA > fileA.new