Since various terminals have a different mapping from colours in the ANSI escape code colour table, I used the standard HTML colours using (which slightly differs from the Terminal.app screenshot on the right):
On the other hand: on many system, the baseline isn’t much more than a shell and a very limited tool set.
With nx like systems that usually comes down to sed and a shell like bash.
Since I wanted to modify an openssh hardening script to cover more permutations that was using sed in a bash script, I had not much choice but to bite the bullet.
TL;DR:
When you use any of the below characters, prepend them with a backslash as they have a bash meaning in addition to a sed meaning.
Bash has been able to access TCP and UDP ports for a while. From the man page:
/dev/tcp/host/port
If host is a valid hostname or Internet address, and port is an integer port number
or service name, bash attempts to open a TCP connection to the corresponding socket.
/dev/udp/host/port
If host is a valid hostname or Internet address, and port is an integer port number
or service name, bash attempts to open a UDP connection to the corresponding socket.
So you could use something like this:
xenon-lornix:~> cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_6.2p2 Debian-6
^C pressed here
Taa Daa!
This for systems that do not have telnet installed (Windows stopped using this a long time ago, many Linux distributions followed suit) and you cannot to use nc (also known as netcat).
The thread at https://github.com/theZiz/aha/issues/20 suggested a case-insensitive regex through sed but the exact suggestion failed for a few reasons I will explain below.
First the bash alias (requires both aha and perl):
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The goal of this book is to document known and unknown methods of doing various tasks using only built-in bash features. Using the snippets from this bible can help remove unneeded dependencies from scripts and in most cases make them faster. I came across these tips and discovered a few while developing neofetch, pxltrm and other smaller projects.
The snippets below are linted using shellcheck and tests have been written where applicable. Want to contribute? Read the CONTRIBUTING.md. It outlines how the unit tests work and what is required when adding snippets to the bible.
See something incorrectly described, buggy or outright wrong? Open an issue or send a pull request. If the bible is missing something, open an issue and a solution will be found.
Sort of tanslated from the first “via” (note that “mit Alles und Scharf” is hard to translate; it’s somewhere between “everything but the kitchen sink, but done right” and “right on the money”):
Bash Prompt Overkill: https://github.com/nojhan/liquidprompt is a Bash “Prompt doing it all right”-extension, which doesn’t care how much any feature costs as we have cores, gigabytes and SSD.
Liquid Prompt automagically recognises context and enables a plethora of features in the prompt when needed based on that context.
It’s like pixie dust for your prompt.
You can configure everything, but you don’t have to: the out of the box experience is already like pixie dust for your prompt.
It works on OS X too and is part of homebrew:
$ brew install liquidprompt
==> Using the sandbox
==> Downloading https://github.com/nojhan/liquidprompt/archive/v_1.11.tar.gz
==> Downloading from https://codeload.github.com/nojhan/liquidprompt/tar.gz/v_1.11
######################################################################## 100.0%
==> Caveats
Add the following lines to your bash or zsh config (e.g. ~/.bash_profile):
if [ -f /usr/local/share/liquidprompt ]; then
. /usr/local/share/liquidprompt
fi
If you'd like to reconfigure options, you may do so in ~/.liquidpromptrc.
A sample file you may copy and modify has been installed to
/usr/local/share/liquidpromptrc-dist
Don't modify the PROMPT_COMMAND variable elsewhere in your shell config;
that will break things.
==> Summary
🍺 /usr/local/Cellar/liquidprompt/1.11: 7 files, 125.6K, built in 3 seconds
[jeroenp:~/Versioned] 10s $
The Wiert Corner - irregular stream of stuff 