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Hello phamnu,

Could you please try this and let me know if this helps.

awk '/GWA quasiparticle energy with Z factor \(eV\)/{A=1;while(A<=98){print;getline;A++}}' Input_file
Above will print...

If you have latest grep you have below options in grep
Context Line Control


or you can use awk


awk 'c-->0;/pattern/{c=98}' Infile

While grouping commands in single line, each commands has to be separated by semi-colon to clearly define boundary:
{ grep -v 'Ni' Md_Coordinates.xyz > test.txt; grep 'H' test.txt > test1.txt; awk...

Assuming that you need those particular lines to be printed:
awk '!((NR-2)%3)' file

Using Elixir's code you don't need to create file before grep.

grep 'F(tot: 1' ft.09 > F1.txtIf you want to append data into the file then just use >> instead of >.:)

grep 'your-pattern' input_file > new_file

@Phamnu :
What you have to understand is :
when in vi or vim you have 2 main mode :
- insertion mode (when you type your code)
- command mode (when you want to tell vi/vim to do some specific...