Re: [CentOS] [OT] Bash help

On 10/25/2017 01:24 PM, m.roth@5-cent.us wrote:

...

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.

<snip> Associative arrays?

Awk! Awk! (No, I am not a seagull...)

sort file | awk '{ array[$1] += $2;} END { for (i in array) { print i "\t" array[i];}'

   mark "associative arrays, how do I love thee? Let me tot the arrays..."

Okay, I'm impressed with this one.  I use awk for simple stuff when sed starts getting weird, but this is absolutely elegant. No offense to the other examples, they are all awesome, but I had no idea awk could do this with such little effort.  Well, I know what I'm studying up on this weekend.