diff --git a/scripts/auto_save.sh b/scripts/auto_save.sh
index 240f778..b923605 100755
--- a/scripts/auto_save.sh
+++ b/scripts/auto_save.sh
@@ -2,10 +2,13 @@
 
 # Automatically commits/pull changes to the remote ZK repository.
 
-tidy_filenames="${EOLAS_DIR}/scripts/tidy_filenames.sh"
-purge_images="${EOLAS_DIR}/scripts/purge_images.sh"
 
-cd $EOLAS_DIR 
+zk=$HOME/repos/eolas
+
+tidy_filenames="${zk}/scripts/tidy_filenames.sh"
+purge_images="${zk}/scripts/purge_images.sh"
+
+cd $zk
 
 echo "Standardising file-names..." 
 source ${tidy_filenames}
diff --git a/scripts/new_zk_note.sh b/scripts/new_zk_note.sh
index 98208fd..d6199d9 100755
--- a/scripts/new_zk_note.sh
+++ b/scripts/new_zk_note.sh
@@ -1 +1 @@
-zk new --title "$1"
+zk new --title "$1" /home/thomas/repos/eolas/zk
diff --git a/zk/format_specifiers_in_c.md b/zk/format_specifiers_in_c.md
new file mode 100644
index 0000000..2d74f65
--- /dev/null
+++ b/zk/format_specifiers_in_c.md
@@ -0,0 +1,21 @@
+---
+id: 5faz2y2e
+title: Format specifiers in C
+tags: []
+created: Thursday, February 29, 2024 | 17:41
+---
+
+# Format specifiers in C
+
+Format specifiers define the type of data to be printed on standard output. You
+need to use format specifiers whenever you are
+[printing-values-in-c](printing-values-in-c.md).
+
+| Specifier | Usage                      |
+| --------- | -------------------------- |
+| `%c`      | single character           |
+| `%s`      | string                     |
+| `%n`      | nothing                    |
+| `%d`      | integer (assuming base 10) |
+| `%f`      | float                      |
+| `%%`      | The percent sign itself    |
diff --git a/zk/printing_values_in_c.md b/zk/printing_values_in_c.md
new file mode 100644
index 0000000..0ad1da5
--- /dev/null
+++ b/zk/printing_values_in_c.md
@@ -0,0 +1,25 @@
+---
+id: 3hcv0amc
+title: Printing values in C
+tags: []
+created: Thursday, February 29, 2024 | 17:33
+---
+
+# Printing values in C
+
+## To print a literal
+
+```c
+printf("hello world")
+```
+
+## To print a variable
+
+```c
+int age = 25
+print("%d", age)
+
+```
+
+The `%d` is an example of a [format specifier](./zk/format-specifiers-in-c.md).
+It is the decimal integer format specifier.
diff --git a/zk/systemd.md b/zk/systemd.md
index 3c0167d..9f28fb3 100644
--- a/zk/systemd.md
+++ b/zk/systemd.md
@@ -49,7 +49,7 @@ are as follows:
   - control service daemons
 - socket units (`.socket`)
   - handle incoming network connection request locations
-- device units (`.device)
+- device units (`.device`)
   - disks and other devices
 - mount units (`.mount`)
   - handle the attachment of filesystems to the system
diff --git a/zk/systemd_status.md b/zk/systemd_status.md
new file mode 100644
index 0000000..6351cdd
--- /dev/null
+++ b/zk/systemd_status.md
@@ -0,0 +1,48 @@
+---
+id: v5f6xkdv
+title: systemd status
+tags: [systemd, systems-programming]
+created: Thursday, February 29, 2024 | 18:19
+---
+
+# Get status of a specific unit
+
+Here I have requested the status of the currently running `mongodb` unit:
+
+```
+$ systemctl status mongod
+mongodb.service - MongoDB Database Server
+     Loaded: loaded (/usr/lib/systemd/system/mongodb.service; enabled; preset: disabled)
+     Active: active (running) since Wed 2022-08-17 07:25:27 BST; 24h ago
+       Docs: https://docs.mongodb.org/manual
+   Main PID: 931 (mongod)
+     Memory: 304.1M
+        CPU: 2min 18.630s
+     CGroup: /system.slice/mongodb.service
+             └─931 /usr/bin/mongod --config /etc/mongodb.conf
+Aug 17 07:25:27 archbish systemd[1]: Started MongoDB Database Server.****
+```
+
+In addition to the core info it tells us the unit type. In this case it is a
+service.
+
+We can also view the journal entry for the given unit. This provides you with
+its diagnostic log messages:
+
+```
+journalctl --unit=mongodb.service
+- Boot b9565dfe8aca4d069143209b3aa84d8e --
+Aug 05 18:31:30 archbish systemd[1]: Started MongoDB Database Server.
+Aug 06 14:27:33 archbish systemd[1]: mongodb.service: Deactivated successfully.
+Aug 06 14:27:33 archbish systemd[1]: mongodb.service: Consumed 3min 17.598s CPU time.
+-- Boot 01922f84c3bd4b3a8f11824cf05f7320 --
+Aug 07 11:58:09 archbish systemd[1]: Started MongoDB Database Server.
+Aug 08 14:43:01 archbish systemd[1]: mongodb.service: Deactivated successfully.
+Aug 08 14:43:01 archbish systemd[1]: mongodb.service: Consumed 5min 28.760s CPU time.
+-- Boot e52b735e115c43bdad8c00462aaff395 --
+Aug 10 13:13:22 archbish systemd[1]: Started MongoDB Database Server.
+Aug 11 07:46:40 archbish systemd[1]: mongodb.service: Deactivated successfully.
+Aug 11 07:46:40 archbish systemd[1]: mongodb.service: Consumed 2min 16.629s CPU time.
+```
+
+Each entry is organised around specific boots.
diff --git a/zk/variables_in_c.md b/zk/variables_in_c.md
new file mode 100644
index 0000000..b29b160
--- /dev/null
+++ b/zk/variables_in_c.md
@@ -0,0 +1,12 @@
+---
+id: r4i16p1x
+title: Variables in C
+tags: [C]
+created: Thursday, February 29, 2024 | 17:20
+---
+
+# Variables in C
+
+```c
+int age = 25
+```