Re: Bash - Readline in nested whiles?

[Olaf Reitmaier Veracierta <olafrv@gmail.com>]

Olaf Reitmaier Veracierta wrote:
> Mike Bird wrote:
> > On Sat March 7 2009 19:48:30 Olaf Reitmaier Veracierta wrote:
> >   
> > > cat list.txt
> > > a
> > > b
> > >
> > > while read r; do echo $r; done  < list.txt;
> > > a
> > > b
> > >
> > > x=0; while read r; do while [ $x -lt 3 ]; do let x=$x+1; echo $r; done;
> > > done  < lista.txt ;
> > > a
> > > a
> > >
> > > Why not the output is? Can't be nested while when reading line?
> > > a
> > > a
> > > a
> > > b
> > > b
> > > bi
> > >
> > > Any comment will be preciated.
> > >     
> >
> > while read r; do x=0; while [ $x -lt 3 ]; do let x=$x+1; echo $r; done;
> > done  < list.txt
> >
> > --Mike Bird
> >
> >
> >   
> Ok, fine Mike Bird.
>
> But ... the real problem is bellow... and is not resolved with x=0 
> within nested while...
>
> I mean the tries=0 bellow...
>
> cat minutly.txt
> # OCTOPUS_SMS_RF 2009-03-08 12:03:07
> 2 1
> 8 2
>
>             instance=1
>             while read line
>             do
>                 echo $line
>                 if [ ! -z "$line" ] && [ `echo $line | grep 
> OCTOPUS_SMS_RF | wc -l` -eq 0 ]
>                 then
>                     field1=`echo $line | cut -d" " -f 1`
>                     field2=`echo $line | cut -d" " -f 2`
>                     script="i${instance}m${field1}p${field2}.sh"
>                     rm -f $script                   
>                     tries=0   
>                     while [ ! -f $script ] && [ $tries -lt 3 ]
>                     do
>                         wget 
> "$url?action=gs&instance=$instance&monitor=$field1&parameter=$field2" -O 
> $script
>                         if [ $? -eq 0 ]
>                         then
>                             tries=3
>                         else
>                             let tries=$tries+1
>                         fi
>                     done
>                 fii
>             done < minutly.txt
>
> The ouput is...
>
> # OCTOPUS_SMS_RF 2009-03-08 12:03:07
> 2 1
> --2009-03-08 00:47:07--  
> http://localhost/octopus/client.php?action=gs&instance=1&monitor=2&parameter=1
> Resolving localhost... 127.0.0.1, ::1
> Connecting to localhost|127.0.0.1|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 322 [text/html]
> Saving to: `i1m2p1.sh'
>
> 100%[==================>] 322         --.-K/s   in 0s     
>
> 2009-03-08 00:47:07 (24.4 MB/s) - `i1m2p1.sh' saved [322/322]
>
> I can to a better code with | | | |  but I don't understand why is 
> doesn't work with nested whiles...

Hi Mike, thanks for your help.

I solved the problem... zooming on what cause exit the cycle and I found 
that there were accidentally some comparison depending on a nonexistent 
file ( if [ `cat ... ) because of this the silent fail the while exited.

Here is the new code ... with wget --tries= ...

while read line
do
  if [ `echo $line | grep OCTOPUS_SMS_RF | wc -l` -eq 0 ]; then
    field1=`echo $line | cut -d" " -f 1`
    field2=`echo $line | cut -d" " -f 2`
    script="i${instance}m${field1}p${field2}.sh"
    rm -f $script
    wget --tries=3 
"$url?action=gs&instance=$instance&monitor=$field1&parameter=$field2" -O 
$script
    if [ ! -e $script ] || [ `cat ${script} | grep OCTOPUS_SMS_RF | wc 
-l` -eq 2 ]; then
       echo "CLIENT: Error can't wget ${script}."
       mail -s "OCTOPUS [ERROR] - $HOSTNAME - wget ${script}" 
$OCTOPUS_MAIL < ${script}	
    fi
  fi
done < ${frequency}.txt

Regards.

--
----------------------------------------------------------------------
   "You don't know where your shadow will fall",
        Somebody.-
----------------------------------------------------------------------
 Ing. Olaf Reitmaier Veracierta <olafrv@gmail.com>
----------------------------------------------------------------------
 http://olafrv.googlepages.com (Personal Webpage)
----------------------------------------------------------------------