Re: [luv-main] Two questions: bash script review and awk/sed/grep

17 Nov 2011

      Hi Marcus,

first I had an error (spot the url=1 instead of url==1 condition?) so  
it did not work that well for multiple appearences.

However, this one should do:

#!/usr/bin/awk -f
{
   if ($1=="Repo-name")  {
      printf "'";
      for (i=3; i<NF; i++) printf $i" ";
      printf $NF"' ";
   }
   if ($1=="Repo-baseurl") {
      url=1;
      comma=match($NF,",");
      if (comma) out=substr($NF,1,comma-1); else out=$NF;
      printf "'"out"' ";
   }
   else {
      if (url==1) {
         if ($1==":") {
            comma=match($NF,",");
            if (comma) out=substr($NF,1,comma-1); else out=$NF;
            printf "'"out"' ";
         }
         else {url=0; print "";}
      }
   }
}

I made it a bit more "C-like" in appearance but the logic is the same.

Regards
Peter

Quoting "Marcus Furlong" <furlongm@gmail.com>:
...
On Wed, Nov 16, 2011 at 15:52, Peter Ross  
<Peter.Ross@bogen.in-berlin.de> wrote:
...
Hi Marcus,
I copied your example into a file (because I do not have a RPM based
Linux at hand)
...
Repo-id      : extras
Repo-name    : CentOS-5 - Extras
Repo-updated : Tue Oct 25 03:18:58 2011
Repo-pkgs    : 237
Repo-size    : 124 M
Repo-baseurl : http://ftp.swin.edu.au/centos/5/extras/x86_64/,
             : http://ftp.monash.edu.au/pub/linux/CentOS/5/extras/x86_64/,
             : http://mirror.aarnet.edu.au/pub/centos/5/extras/x86_64/
Repo-expire  : 3,600 second(s) (last: Wed Nov 16 12:39:48 2011)
and piped into the following quick&dirty awk script:
#!/usr/bin/awk -f
$1=="Repo-name"         {printf "'"; for (i=3; i<NF; i++) printf $i" ";
                         printf $NF"' "}
$1=="Repo-baseurl"      {url=1;
                         comma=match($NF,",");
                         if (comma) out=substr($NF,1,comma-1); else out=$NF
                         printf "'"out"' "}
url=1                   {if ($1==":") {
                            comma=match($NF,",");
                            if (comma) out=substr($NF,1,comma-1);  
else out=$NF
                            printf "'"out"' "}
                         else url=0}
The result is:
$ cat /tmp/mom | /tmp/mom.awk
'CentOS-5 - Extras' 'http://ftp.swin.edu.au/centos/5/extras/x86_64/'
'http://ftp.monash.edu.au/pub/linux/CentOS/5/extras/x86_64/'
'http://mirror.aarnet.edu.au/pub/centos/5/extras/x86_64/'
(One line actually)
Happy with it?
Hi Peter,
Thanks, yes! It almost does the trick. If there were multiple repos
(e.g. the above text repeated again a few times), how would I go about
adding a newline after each one? I've tried to modify your example but
my awk-fu is not good! E.g. the following is on two lines:
'CentOS-5 - Extras' 'http://ftp.swin.edu.au/centos/5/extras/x86_64/'
'http://ftp.monash.edu.au/pub/linux/CentOS/5/extras/x86_64/'
'http://mirror.aarnet.edu.au/pub/centos/5/extras/x86_64/'
'CentOS-5 - Updates' 'http://ftp.swin.edu.au/centos/5/updates/x86_64/'
'http://ftp.monash.edu.au/pub/linux/CentOS/5/updates/x86_64/'
'http://mirror.aarnet.edu.au/pub/centos/5/updates/x86_64/'
...
Sorry for not debugging your sed scripts, I have a problem to
understand my own;-) (That's why I prefer awk as long as it seems
doable by awk, it is easier to understand and read than sed)
Haha, yeah I often cringe when I have to go back months later and try
to understand what I wrote in sed.
Thanks,
Marcus.
--
Marcus Furlong