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Stuck behind a restrictive firewall at work, but really jonesing to putty home to your linux box for some colossal cave? Goodness knows I was...but the firewall at work blocked all outbound connections except for ports 80 and 443. (Those were wide open for outbound connections.) So now I putty over port 443 and have my linux box redirect it to port 22 (the SSH port) before it routes it internally. So, my specific command would be:
$iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 22
Note that I use -A to append this command to the end of the chain. You could replace that with -I to insert it at the beginning (or at a specific rulenum).
My linux box is running slackware, with a kernel from circa 2001. Hopefully the mechanics of iptables haven't changed since then. The command is untested under any other distros or less outdated kernels.
Of course, the command should be easy enough to adapt to whatever service on your linux box you're trying to reach by changing the numbers (and possibly changing tcp to udp, or whatever). Between putty and psftp, however, I'm good to go for hours of time-killing.
Leave out pygmentize or `pip install pygments` first.
Redshift will adjust the color temperature and protects eye at night
-b : will adjust the brightness
txt2regex can be interactive or noninteractive and generates regular expressions for a variety of dialects based on user input. In interactive mode, the regex string builds as you select menu options. The sample output here is from noninteractive mode, try running it standalone and see for yourself. It's written in bash and is available as the 'txt2regex' package at least under debian/ubuntu.
Tested in Linux and OSX
This appends (-A) a new rule to the INPUT chain, which specifies to drop all packets from a source (-s) IP address.
the `jq` tool can also be used do validate json files and pretty print output
`cat file.json | jq`
available on several platforms, including newer debian-based systems via `#sudo apt install jq`, mac via `brew install jq`, and from source
https://stedolan.github.io/jq/download/
The OPs solution will work, however on some systems (bsd), grep will not filter the data, unless the --line-buffered option is enabled.