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POawk-1-liner to sum numbers in stdin, while printing number of occurrences of certain text along with other arbritrary text
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copied!<p>I'm definitely interested in getting a book on awk. I've been won over, despite playing with it for little time. However, in the mean time, I have a problem I suspect I could solve exclusively with [g]awk. To demonstrate, I'll use some fdisk output. In this example, the desired end result would be something like:</p> <pre><code>Disks: 2 [240 GB total] sda=120 GB sdb=120 GB </code></pre> <p>Here's what I have:</p> <pre><code>fdisk -l 2>/dev/null | awk '/^Disk \/dev\/[vsh]d./ {bytes+=$5} END {print "Disks: "NR" ["; gb=bytes/1024/1024/1024; print gb" GB total]"}' </code></pre> <p>My NR apparently prints out 73.. on my laptop with two hard drives, anyway. This, I do not understand. So far, well.. I'm maybe half-way there. Any tips or succinct tutorials would be greatly appreciated!</p> <hr> <p>After two major excellent answers, I ended up with the following:</p> <pre><code>echo DISKS: $(fdisk -l 2>/dev/null | awk -F/ '/^Disk \/dev\/[vsh]d.|^Disk \/dev\/xvd./{print$3}' | awk '{d++;bytes+=$4;disk[$1]=$2" "$3}END{gb=bytes/1024/1024/1024; printf gb" GB total, "d" disks\n";for (i in disk) print " "i,disk[i]}' | sed -e "s/,$/ /" -e "s/: / /") </code></pre> <p>Which gave me output like this:</p> <pre><code>DISKS: 78.3585 GB total, 2 disks sda 80.0 GB sdb 4110 MB </code></pre> <p>Looking forward to the day I can do that all in one awk command with no sed. :) But for now, thanks folks!</p>

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