Is there a way to match such pattern with shell or sed?

Question

I have a file with following output:

BP 0 test:
    case    id          Name            
    ======  ========  =================
         0        82  a_case-2-0-0      

BP 1 test:
    case    id          Name            
    ======  ========  =================
         0        86  a_case-2-1-0      

BP 2 test:
    case    id          Name            
    ======  ========  =================


BP 3 test:
    case    id          Name            
    ======  ========  =================
         0        93  a_case-2-3-0 

so, only "BP 0,1,3" have content, so what I want is, is it possible to dump 'BP 0 test','BP 1 test' and 'BP 3 test' only, just want to ingore the 'BP 2 test' because of no test case.

Thanks for your help.

Answer 1

$ awk -F'\n' -v RS='' -v ORS='\n\n' 'NF>3' input.txt
BP 0 test:
    case    id          Name
    ======  ========  =================
         0        82  a_case-2-0-0

BP 1 test:
    case    id          Name
    ======  ========  =================
         0        86  a_case-2-1-0

BP 3 test:
    case    id          Name
    ======  ========  =================
         0        93  a_case-2-3-0

Answer 2

While you could whack something together using smaller shell tools like [ and expr, it'll be way easier to do this using awk, which you'll usually find in any operating system that also includes grep and sed. :)

Here's a quick-and-dirty:

[ghoti@pc ~]$ cat doit 
#!/usr/bin/awk -f

/^BP/ {
  output=$0;
  getline; output=sprintf("%s\n%s", output, $0);
  getline; output=sprintf("%s\n%s", output, $0);
  getline;
  if (/[0-9]/) {
    output=sprintf("%s\n%s\n", output, $0);
    print output;
  }
}

[ghoti@pc ~]$ ./doit input.txt 
BP 0 test:
    case    id          Name            
    ======  ========  =================
         0        82  a_case-2-0-0      

BP 1 test:
    case    id          Name            
    ======  ========  =================
         0        86  a_case-2-1-0      

BP 3 test:
    case    id          Name            
    ======  ========  =================
         0        93  a_case-2-3-0 

[ghoti@pc ~]$ 

Note that this script assumes some things about your input data. If the conditions in the if statement don't work for you, or if there's the possibility of multiple cases after a single test, this script will need to be adjusted.