I'm having a heard time figuring out how to extract the IP information out of an output similar to this:

Fri Jun  9 19:01:54 2017,,devi1,0,unknown os
Fri Jun  9 19:01:54 2017,,host1,0,unknown os
Fri Jun  9 19:01:54 2017,,srv01,0,unknown os
Sat Jun 10 23:11:13 2017,,switch.domain.com,0,unknown os

Any tips on how I can, from that output, get:

Running on Bash 4.3.30 in Linux.

Any help would be greatly appreciated. Thank you very much!

  • awk -F, '{print $2}' file – RomanPerekhrest Jun 13 '17 at 21:29
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    A note for those who follow: if your data is CSV (comma separated values) as opposed to simply being comma delimited, you'll want to use a csv library, or something like csvtool -- there's a lot more to CSV than commas and text, as it might at first appear. – Barton Chittenden Jun 13 '17 at 21:54

While you could do this with awk or sed, for a simple extraction between fixed delimiters cut is probably the best fit:

$ cut -d, -f2 < input
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    No need to use an indirection ('<'); cut takes a file as an argument. – DopeGhoti Jun 13 '17 at 21:32

With awk:

awk -F, '{print $2}' /path/to/input

With cut:

cut -d, -f2 /path/to/input
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    one approach - from my comment, the other - from @ilkkachu answer – RomanPerekhrest Jun 13 '17 at 21:37

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