fork download
copy 
  1. /^@/ { last_line=$0; line_to_print=true }
  2. /^[^@]/ { if ( line_to_print == true ) print last_line; print $0; line_to_print=false }
  3. END { if ( line_to_print == true ) print last_line }
Success #stdin #stdout 0.01s 4276KB
comments (?)
stdin
copy 
abc

@abc

@def

333

@asd

@poi

@789
stdout
copy 
abc
@def
333
@789
https://ideone.com/Ng7p2
language:
AWK (gawk 4.2.1)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!