Expand linux page a bit

content/docs/software/alpine.adoc

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-+++
-+++
-
-== Alpine
-
-https://www.alpinelinux.org/[Alpine] is a lightweight linux distribution that
-uses musl libc and busybox. It is often used in docker images due to its
-relatively small footprint.
-
-=== Notes
-
-* The equivalent of Ubuntu's `build-essential` is `build-base`

content/docs/software/linux.adoc

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 +++
 
+:source-highlighter: pygments
+:source-language: console
+
 == Linux
 
-=== Notes
+=== Random commands
+
+Split some pages from a PDF::
+[source]
+----
+$ pdftk myoldfile.pdf cat 1 2 4 5 output mynewfile.pdf
+----
+Resizing disks::
+[source]
+----
+$ fdisk     # delete and recreate the partition
+$ resize2fs # resize to the new partition
+----
+Adjust IO priority::
+[source]
+----
+$ iotop -c 3 pid  # -c 3 is "when idle"
+----
+Take a screenshot of an area::
+[source]
+----
+$ scrot -s output.png
+----
+
+=== Alpine
+
+https://www.alpinelinux.org/[Alpine] is a lightweight linux distribution that
+uses musl libc and busybox. It is often used in docker images due to its
+relatively small footprint.
+
+==== Notes
 
-* `iotop` adjusts priorities of I/O - `-c 3` is 'when idle'
-* Resizing disks:
-1. `fdisk` to delete and recreate the partition
-2. `resize2fs` to resize to the new partition
+* The equivalent of Ubuntu's `build-essential` is `build-base`