Thanks, Jeremiah, although wouldn't that return every item being grepped for,
rather than the last one of each? Here's an example data set:
Local Total: Bad
Local Total: Bad
Local Total: Bad
Local Total: Good
Regional Total: Bad
Regional Total: Good
Local Total: Bad
Local Total: Bad
Local Total: Good
Regional Total: Bad
Regional Total: Bad
Regional Total: Good
Company Total: Good
So only the last of each set of totals should be returned since those are the
only "good" ones.
Maybe a better example of the code: (with elifs as suggested):
#!/bin/bash
local=0
tac reportfile |
{
while read line; do
if [[ $local = 1 && `echo $line | grep 'Local Total'` != "" ]]; then
let local=0
echo "$line"
continue
elif [[ $local = 0 && `echo $line | grep 'Regional Total'` != "" ]]; then
let local=1
echo "$line"
continue
elif [[ `echo $line | grep 'Company Total'` != "" ]]; then
echo "$line"
fi
done
}
The idea is whenever a regional total is found, print it and then start looking
for local totals. As soon as one is found, print it and stop looking for local
totals.
________________________________
From: Jeremiah Bess <[email protected]>
To: [email protected]
Sent: Thursday, August 20, 2009 8:16:35 PM
Subject: [lug:14947] Re: Parsing with bash
Put the search lines into a single file, one per line. Then run this command:
grep -f searchfile reportfile
The -f will use each line in the "searchfile" as a grep pattern.
If you want to keep the if statements (or for future reference) you should use
an "else if" command. http://www.freeos.com/guides/lsst/ch03sec03.html
Jeremiah E. Bess
Network Ninja, Penguin Geek, Father of four
On Thu, Aug 20, 2009 at 20:45, Jason Montoya <[email protected]> wrote:
I've been working on a way to parse a report file where there are several
hierarchies of data (say, company totals, regional totals, local totals) and
using a while read line loop with greps to identify the appropriate data. It
works, but it's *very* slow. Essentially it's in the form of
>
>tac reportfile |
>{
>while read line; do
>
>if [[ `echo $line | grep 'Company Total'` != "" ]]; then echo "$line"
>fi
>
>if [[ `echo $line | grep 'Regional Total'` !="" ]]; then echo "$line"
>>
>fi
>
>if [[ `echo $line | grep 'Local Total'` != "" ]]; then echo "$line"
>fi
>
>done
>}
>
>The reason i do it this way is there are multiple of the lower totals and I
>only want the last one in each. (there's logic for it but for simplicity I'm
>not showing it here).
>
>I know
> I could learn perl or python or something and do it faster than all these
> subshells to grep, but I'm interested to know if there is a faster way to do
> this in bash?
>
>
>
>
>
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