lsofer

Thinking of it more as a generic environment enumerator (that definitely works without any caveats). Tried solving solving a similar abstraction after getting annoyed with infrastructures that didn't have lsof installed consistently, or had different versions strewn about: https://github.com/red-bin/lsofer/blob/master/lsofer.sh

/proc is amazing once you get the hang of it and get a good understanding of what's all in there. Especially if you're doing low level performance tuning. It's particularly helpful in larger infrastructures where tool variability means differences in available commands, their output, and cli options. I'm sure /proc iteration has its own issues of variability across large infrastructres, but I haven't seen it. It's a fairly consistent API. Or at least it was, since I haven't touched a large infrastructure in some time. When I got tired of `lsof` not being installed on hosts (or when its `-i` param isn't available) I ended up writing a script [1] that just iterates through /proc over ssh and grabs all inet sockets, environment variables, command line, etc from a set of hosts. Results in a null-delimited output that can then be fed into som

Oh yeah, bash functions are great and absolutely abusable. Sometimes you need some grand hacks to get it to work well, but when it works well, it can do some magic. You can even export functions over ssh! I wrote this a few years back which ran on bunches of hosts and fed into an infrastructure network mapper based on each hosts' open network sockets to other known hosts. It wasn't really feasible to install a set of tools on random hosts.. but I still had root ssh access across the board. So I needed something tool agnostic, short, auditable, and effectively guaranteed to work: https://github.com/red-bin/lsofer/blob/master/lsofer.sh

Hah, I wrote something very, very similar to this recently. The problem I eventually had with it was that lsof wasn't always installed on the hosts I was working with. So, it turned into a script to parse through /proc and other nonsense. https://github.com/red-bin/lsofer/blob/master/lsofer.sh (wish I could paste the graphing code, but it's code I wrote at my company.)

The code is behind my company's GH, but here's a rewrite of the collector script: https://github.com/red-bin/lsofer/blob/master/lsofer.sh