sed or awk to parse this text Post: 302449521

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Top Forums Shell Programming and Scripting sed or awk to parse this text Post 302449521 by agama on Monday 30th of August 2010 10:42:48 PM

08-30-2010

Registered User

This is a quick example. There are probably other ways to do it, but this is straight forward:

Code:

awk '
        /^[*]/ {                            # new section 
                if( snarf )
                        printf( "\n" );         # terminate the last section
                snarf = 1;                      # open the section
                n = index( $0, "-" );           # find first -
                printf( "%s ", substr( $0, n+1 ) );     # print everything after the first dash
                next;
        }

        NF == 0 { 
             if( snarf )
             {
                  snarf = 0; 
                  printf( "\n" );
              }
              next; 
       }     #terminate section on blank line

        snarf > 0 {                         # if in section print this line. 
                printf( "%s ", $0 );
                next;
        }

        END {
                if( snarf )                    # need to finish the last section with newline
                        printf( "\n" );
        }
'

It does assume that each section starts with an asterisk (*) and that if it is continued onto multiple lines the section ends with the next asterisk or a blank line. The output from each section is put on one line (no intermediate newlines) even if it was on multiple lines in the input. Each section is placed on a separate line.

Hope this helps.

Last edited by agama; 08-30-2010 at 11:59 PM.. Reason: Clarification in description

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elf_strptr

elf_strptr(3E)															    elf_strptr(3E)

NAME

       elf_strptr - make a string pointer

SYNOPSIS

       [flag... ] file...  [library] ...

DESCRIPTION

       This  function converts a string section offset to a string pointer.  elf identifies the file in which the string section resides, and sec-
       tion gives the section table index for the strings.  normally returns a pointer to a string, but it returns a  null  pointer  when  elf	is
       null, section is invalid or is not a section of type the section data cannot be obtained, offset is invalid, or an error occurs.

EXAMPLES

       A  prototype  for retrieving section names appears below.  The file header specifies the section name string table in the member.  The fol-
       lowing code loops through the sections, printing their names.

	       if ((ehdr = elf32_getehdr(elf)) == 0)
	       {
		       /* handle the error */
		       return;
	       }
	       ndx = ehdr->e_shstrndx;
	       scn = 0;
	       while ((scn = elf_nextscn(elf, scn)) != 0)
	       {
		       char    *name = 0;
		       if ((shdr = elf32_getshdr(scn)) != 0)
			   name = elf_strptr(elf, ndx,
					     (size_t)shdr->sh_name);
		       printf("'%s'
", name? name: "(null)");
	       }

   Note
       A program may call to retrieve an entire string table section.  For some applications, that would be both more efficient  and  more  conve-
       nient than using

SEE ALSO

       elf(3E), elf_getdata(3E), elf_getshdr(3E), elf_xlate(3E).

																    elf_strptr(3E)