Shell Programming and Scripting

BACKGROUND:

I am using Solaris 10. Some of my boxes have gnu grep and I can use -A and -B flags on those. However, the solaris flavor of grep won't use the flags -A or -B. And some of my boxes won't be getting gnu grep.

Should I try using perl, awk, or sed?

Actual PROBLEM: I am grepping the oracle_alert.log for "ORA-". This solution means that I have to go read the alert.log manually. I would like to be able to cut out the 2 lines preceding and 6 lines following each (distinct) "ORA-" error message.

Thanks for your help.

Wayne

I would like to point out that while I have done some scripting in the past, I am not great at any of the programs mentioned - perl, awk, sed.

I would like to know which tool set to learn up on to do this the best (cross shell capability.)

Thanks.

Wayne

I WANT TO GET OUTPUT LIKE THIS
*
**
***
****
IN SHELL SCRPTING
USING VI EDITOR

I AHVE TRIED THIS

for i in 1 2 3 4
do
for j in $i
do
echo "*"
done
done

It can be done with sed, but awk is the logical tool to use for this. See the article at http://www.unixreview.com/documents/s=9455/ur0412b/ for such a script.

Please do not post a new subject in an old thread. [Perhaps the moderator can move this into a new thread]

[INDENT]
What does the editor have to do with it? You can write a script in any editor, or even directly on the command line.

[/INDENT

Why do you expect $i to be interpreted as more than one argument in the inner loop, but not in the outer one?

You can use two loops if you want:

Code:

for i in 1 2 3 4
do
           j=0
           while [ $j -lt $i ]
           do
                      printf "%s" "*"
                      j=$(( $j + 1 ))
          done
          echo
done

But you only need one loop:

Code:

star=*
for i in 1 2 3 4
do
  printf "%s\n" "$star"
  star=$star*
done

el_guero,
See if this works for you:

Code:

typeset -i cntLines=0
typeset -i cntORA
Prev1=""
Prev2=""
FoundORA="N"
while read ILine
do
 cntORA=`echo $ILine | egrep -c 'ORA-'`
 if [ $cntORA -gt 0 ]; then
   echo $Prev2
   echo $Prev1
   FoundORA="Y"
 fi
 if [ "$FoundORA" = "Y" ]; then
   echo $ILine
   cntLines=$cntLines+1
   if [ $cntLines -gt 6 ]; then
     cntLines=0
     Prev1=""
     Prev2=""
     FoundORA="N"
   fi
 else
   Prev2=$Prev1
   Prev1=$ILine
 fi
done < input_file

Thank You,

Wayne