Although "not my question", thanks, I learned a lot about array processing from your example.
----- Original Message -----
From: "warren" <warren@xxxxxxxxxxx>
To: "centos" <centos@xxxxxxxxxx>
Sent: Wednesday, October 25, 2017 11:47:12 AM
Subject: Re: [OT] Bash help
On Oct 25, 2017, at 10:02 AM, Mark Haney <mark.haney@xxxxxxxxxxx> wrote:
>
> I have a file with two columns 'email' and 'total' like this:
>
> me@xxxxxxxxxxx 20
> me@xxxxxxxxxxx 40
> you@xxxxxxxxxx 100
> you@xxxxxxxxxx 30
>
> I need to get the total number of messages for each email address.
This screams out for associative arrays. (Also called hashes, dictionaries, maps, etc.)
That does limit you to CentOS 7+, or maybe 6+, as I recall. CentOS 5 is definitely out, as that ships Bash 3, which lacks this feature.
#!/bin/bash
declare -A totals
while read line
do
IFS="\t " read -r -a elems <<< "$line"
email=${elems[0]}
subtotal=${elems[1]}
declare -i n=${totals[$email]}
n=n+$subtotal
totals[$email]=$n
done < stats
for k in "${!totals[@]}"
do
printf "%6d %s\n" ${totals[$k]} $k
done
You’re making things hard on yourself by insisting on Bash, by the way. This solution is better expressed in Perl, Python, Ruby, Lua, JavaScript…probably dozens of languages.
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