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.

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