coreutils
awk-hack-the-planet
coreutils | awk-hack-the-planet | |
---|---|---|
112 | 5 | |
4,024 | 230 | |
2.7% | - | |
9.3 | 3.8 | |
7 days ago | 8 months ago | |
C | Ruby | |
GNU General Public License v3.0 only | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
coreutils
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GNU Coreutils 9.5 Can Yield 10~20% Throughput Boost For cp, mv and cat Commands
https://github.com/coreutils/coreutils/commit/fcfba90d0d27a1...
A summary of other changes just released in GNU coreutils 9.5 are:
* mv accepts --exchange to swap files
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How the GNU coreutils are tested
> some are simple like yes(1)
Not that simple: https://github.com/coreutils/coreutils/blob/master/src/yes.c
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Show HN: Usr/bin/env Docker run
The -S / --split-string option[1] of /usr/bin/env is a relatively recent addition to GNU Coreutils. It's available starting from GNU Coreutils 8.30[2], released on 2018-07-01.
Beware of portability: it relies on a non-standard behavior from some operating systems. It only works for OS's that treat all the text after the first space as argument(s) to the shebanged executable; rather than just treating the whole string as an executable path (that can happen to contain spaces).
Fortunately this non-standard behavior is more the norm than the exception: it works at least on modern GNU/Linux, BSDs, and macOS.
[1] https://www.gnu.org/software/coreutils/manual/html_node/env-...
[2] https://github.com/coreutils/coreutils/blob/b09dc6306e7affaf...
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From Nand to Tetris: Building a Modern Computer from First Principles
> building a cat from scratch
> That would be an interesting project.
Here is the source code of the OpenBSD implementation of cat:
> https://github.com/openbsd/src/blob/master/bin/cat/cat.c
and here of the GNU coreutils implementation:
> https://github.com/coreutils/coreutils/blob/master/src/cat.c
Thus: I don't think building a cat from scratch or creating a tutorial about that topic is particularly hard (even though the HN audience would likely be interested in it). :-)
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The Linux Scheduler: A Decade of Wasted Cores (2016) [pdf]
the yes command, writing to /dev/null, is making IO calls, which interfere with predictable scheduling.
If you look at the source code for yes, https://github.com/coreutils/coreutils/blob/master/src/yes.c
it builds a buffer of output and then writes that in a for loop
while (full_write (STDOUT_FILENO, buf, bufused) == bufused)
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nohup not working?
Looking at the source of nohup, if the execvp() of the child happens then it _must_ have already done the signal (SIGHUP, SIG_IGN) so - WTF?
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Is it fair to say "ls" is dead? No commits in 15 years
This got me wondering so I went and looked and it seems like lo and behold there was actually a commit to the GNU ls source just 2 weeks ago.
https://github.com/coreutils/coreutils/blob/master/src/ls.c
"maint: prefer char32_t to wchar_t"
- The Tao of Programming
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Decoded: GNU Coreutils
even an empty file? Yes. so now it was a file with a copyright disclaimer and nothing else. And the koan-like question comes to mind is "Can you copyright nothing?" well AT&T sure tried.
Then somebody said our programs should be well defined and not depend on a fluke of unix, which at this point was probable a good idea. so it became "exit 0"
Then somebody said we should write our system utilities in C instead of shell so it runs faster. openbsd still has a good example of how this would look.
http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr....
At some point gnu bureaucracy got involved and said all programs must support the '-h' flag. so that got added, then they said all programs must support locale so that got added. now days gnu true is an astonishing 80 lines long.
https://github.com/coreutils/coreutils/blob/master/src/true....
http://trillian.mit.edu/~jc/humor/ATT_Copyright_true.html
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Exa Is Deprecated
> Yes, ls is maintained. Although, maintained is a very strong word. It exists.
Why would it be a strong word? Here it is, in src/ls.c: https://github.com/coreutils/coreutils
It is then packaged by tens of operating system distributions, who themselves maintain extra patchsets, some of which are then upstreamed.
It is installed and used on millions (billions?) of devices, for 3 decades.
It's a very reliable and trusty "sharp stick of metal" :)
awk-hack-the-planet
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Aho – a Git implementation in Awk
Disclaimer: self promotion
If you're looking to get into Awk, and you learn well from a lecture style, I put together a talk for Linux Fest Northwest some years ago and recorded it for Youtube: https://youtu.be/E5aQxIdjT0M
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(F18) cis student need help writing an awkward command file for price calculation, professor won't help.
Re awk (which equally has its r/awk), the combination of presentation, exercise and GitHub repo of training data by Benjamin Porter is a nice resource, too.
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Easily handle CLI operation via Python instead of regular Bash programs
For people that know Ruby, if you haven't explored Ruby's CLI abilities, you definitely, definitely should. When I was building my (free and open source) awk course[1] I fell in love with awk. When I later found out that Ruby has some of the same features, it changed my life: I
https://robm.me.uk/2013/11/ruby-enp/
https://benoithamelin.tumblr.com/ruby1line/
[1]: https://github.com/FreedomBen/awk-hack-the-planet
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I wrote a super tiny Linux system fetch script in just shell commands
Awk: Hack the Planet It has a youtube vid and problems to work through.
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Getting better at Linux with 10 mini-projects
Kind of a shameless plug, but you mentioned wanting to get better at Awk. I had that same desire and created a small course based on what I learned. The course got great feedback.
There is a video presentation, and a set of "challenges" you can use to incrementally get more complex with awk, starting from super simple.
The challenges repo is on github here: https://github.com/FreedomBen/awk-hack-the-planet
If you want to watch the videos, there are links in the github repo but for convenience:
Presentation video: https://youtu.be/43BNFcOdBlY
My solutions to exercises video: https://youtu.be/4UGLsRYDfo8
What are some alternatives?
util-linux
bashcrawl
madaidans-insecurities
scripting_course - :notebook: Books, reference guides and resources on Regular Expressions, CLI one-liners, Scripting Languages and Vim.
busybox - BusyBox mirror
simple-awk - Simple and practical guide to awk.
src - Read-only git conversion of OpenBSD's official CVS src repository. Pull requests not accepted - send diffs to the tech@ mailing list.
sysfetch - A super tiny system information fetch script written in BASH
linux - Linux kernel source tree
starship - ☄🌌️ The minimal, blazing-fast, and infinitely customizable prompt for any shell!
gnulib - upstream mirror
xonsh - :shell: Python-powered, cross-platform, Unix-gazing shell.