unlawfulbooger

You could try [0-9] instead?

awk '/\/dev\/loop[0-9]/ {print}'

If you have a larger sample of input and desired output, people can help you better.

I get it, sometimes you just do something for the challenge.

It’s really great what you can accomplish when you know a little more than the bare minimum of the tools at your disposal (^^,)

And I had the same experience after learning a bit more about awk for the fist time, hahaha.

Virtual memory is different from swap memory.

Swap memory is used when you run out of physical memory, so the memory is extended to your storage.

Virtual memory is an abstraction that lies between programs using memory and the physical memory in the device. It can be something like compression and memory-mapped files, like mentioned.

And yes, some swap is still useful, up to something like 4G for larger systems.

And if you want to hibernate to disk, you may need as much swap as your physical memory. But maybe that’s changed. I haven’t done that in years.

As long as it helps you, right?

Good luck!

Ah I now get what you’re trying to do, I think?

Having some kind of sonic(?) shorthand for specific spellings right?

It’s kind of like trying to solve the Gothi problem, maybe?

Needlessly complicated, but that’s a common theme in English anyway, so it should fit right in.

And I love this line 😂

If you’re mapping a specific mouth sound to a specific character, why not use the IPA? That’s exactly what it is designed to do.

That way you don’t have to reinvent the wheel.

For a better introduction to the IPA, check this video.

In the end I've used the first command you wrote, because KISS, but I appreciate your explanation

There’s no shame in combining multiple tools, that’s what pipelines are all about 😄.

Also there’s a different tool that I would use if I want to output a specific column: awk

df -h —output=avail,source | awk ‘/\/dev\/dm-2/ {print $1}’

For lines matching /dev/dm-2 print the first column. awk splits columns on whitespace by default.

But I would probably use grep+awk.

Sed is definitely a very powerful tool, which leads to complex documentation. But I really like the filtering options before using the search/replace.

You can select specific lines, with regex or by using a line number; or you can select multiple lines by using a comma to specify a range.

E.g. /mystring/,100s/input/output/g: in the lines starting from the first match of /mystring/ until line 100, replace input with output

The easiest way is probably without sed, which you mentioned:

df -h --output=avail /dev/dm-2| tail -n1

But purely with sed it would be something like this:

df -h --output=avail,source | sed -n ‘/\/dev\/dm-2/s!/dev/dm-2!!p’

-n tells sed to not print lines by default

/[regex]/ selects the likes matching regex. We need to escape the slashes inside the regex.

s/// does search-and-replace, and has a special feature: it can use any character, not just a slash. So I used three exclamation points instead , so that I don’t need to escape the slashes. Here we replace the device with the empty string.

p prints the result

Check the sed man page for more details: https://linux.die.net/man/1/sed

🦀 🦀🦀🦀🦀🦀🦀🦀

Boy am I glad I don’t do C++ anymore. That string handling with the overloaded bitshift operator was wild.

What the heck is endl???

If you’re not already, just erase your darlings.

Then you can preview what files are lost on reboot (see blogpost).