Parse value from output using AWK

Question

I need to parse the value, after the 100th of a second from output, from an FTP get command.

ftp> 8.591220.98disconnect

With assistance from Stack members I've been using the following to obtain the data:

ut1intput=$(awk 'NR==70{for(i=1;i<=NF;i++)if($i=="ftp>")print $(i+1)} filename.txt)

I'm using sed to strip the word "disconnect" from the output, but am perplexed as to how to print only the 100th of a second output, i.e.: 8.591220.98

Is awk the right tools for this task?

I'd appreciate any advice.

What do you mean by 100th of a second output? Do you really want the whole 8.591220.98 token, or just the portion after the last .? Given that 8.591220.98 is not a valid number, what exactly does it represent? — mklement0
– mklement0, Commented Mar 31, 2014 at 22:01

mklement0 · Accepted Answer · 2014-04-01 13:44:30Z

1

To solve just the immediate problem:

If all you need is to extract the number-like token from your input data, you could simply use tr as follows:

tr -C -d '0-9.' <<<'ftp> 8.591220.98disconnect' # -> '8.591220.98'

But it makes more sense to integrate the desired operation into your original awk program, using sub(), as in @Håkon Hægland's answer:

ut1intput=$(awk '
  NR==70 {
    for(i=1;i<=NF;i++) { 
      if($i=="ftp>") {
        sub(/disconnect$/, "", $(i+1));  # remove 'disconnect' suffix
        print $(i+1)
      }
    }
  }' filename.txt)

edited Apr 1, 2014 at 13:44

answered Mar 31, 2014 at 21:44

mklement0

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1 Comment

Adrian Frühwirth Over a year ago

You don't want to use brackets for sets in tr, they are not required and may lead to unexpected results depending on the string in question and its parsing. Consider: tr '.-' '12' <<< '._[]?=' => 1_[]?= vs. tr '[.-]' '[12]' <<< '._[]?=' => 1_]]]]. You only want to use them for character classes.

Håkon Hægland · Accepted Answer · 2014-03-31 21:15:37Z

0

The awk command sub(/disconnect/,"", $i) will strip the word disconnect from field number $i. For instance:

echo "8.591220.98disconnect" | awk '{sub(/disconnect/,"", $1)}1'

gives:

8.591220.98

answered Mar 31, 2014 at 21:15

Håkon Hægland

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