Merge branch 'master' into vhs

README.md

@@ -26,6 +26,8 @@ The chronology should never branch.
 If `gitea` can use three different types of database, the documentation should simply pick one and continue instructions from there.
 Repetition works better than a reference - if a database requires three commands to set up, it's better to repeat those three commands for every program that requires a database than to just link to another file which discusses databases.
 
+---
+
 ### Closing
 
 Introductory documents should show anything required to cleanly uninstall a program, without leaving bulky configuration files behind.
@@ -52,6 +54,8 @@ Non-commands (e.g. output) should be shown as quoted text:
 > Mail         kn
 > Projects     music
 
+---
+
 # Example
 
 ```

basics/cron.md

@@ -14,20 +14,31 @@ Once installed, search for the service name, and start it.
 
 ```bash
 sudo systemctl list-unit-files | grep cron
+sudo systemctl enable --now $NAME
 ```
 
+Make a file for your crontab, like this:
+
 ```bash
-sudo systemctl enable --now cron
+echo '39 */3 * * * /usr/bin/updatedb' > "$USER".cron
 ```
 
-You can *e*dit your crontab with:
+Then apply that crontab:
 
 ```bash
-crontab -e
+crontab "$USER".cron
+rm "$USER".cron
 ```
+The `cron` program will check your syntax before adding the tab.
 
+Your crontab file sits somewhere in `/var/spool/`.
+Probably in `/var/spool/cron`.
 
-> 39 */3 * * * /usr/bin/updatedb
+Check how your tab currently looks:
+
+```bash
+crontab -l
+```
 
 ## Syntax
 
@@ -91,7 +102,7 @@ run-parts /etc/cron.hourly
 ### Variables
 
 Add your `$HOME` to crontab to use scripts.
-First add `HOME=/home/user`, then you can use syntax like this:
+First add `HOME=/home/$USER`, then you can use syntax like this:
 
 0 * * * * $HOME/.scripts/myScript.sh
 
@@ -100,7 +111,6 @@ First add `HOME=/home/user`, then you can use syntax like this:
 ```bash
 $HOME/.scripts/myScript.sh
 ```
-
 You can also add your regular path to your crontab as a variable (see example below).
 If you're using vim as the editor, just run this at the top of your crontab:
 
@@ -131,5 +141,3 @@ PATH=/usr/condabin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/u
 50 18 * * * /usr/bin/timeout 30m /usr/bin/syncthing
 
 ```
-
-

basics/eval.md

@@ -0,0 +1,22 @@
+---
+title: "eval"
+tags: [ "basics" ]
+---
+
+Compose a statement for execution.
+
+```bash
+x='echo $y'
+echo $x
+y=dragon
+eval "$x"
+```
+
+The results remain in the current shell, unlike sub-shells.
+
+```bash
+b=basilisk
+sh -c 'echo $b'
+eval "g=goblin"
+echo $g
+```

basics/games.md

@@ -0,0 +1,11 @@
+---
+title: "bash games"
+tags: [ "Documentation", "Games" ]
+---
+
+Games are a great way to learn bash.
+
+- `mapscii.me` is an interactive terminal map.
+    1. Install telnet.
+    1. `telnet mapscii.me`
+- [Over the Wire](https://overthewire.org/wargames) teaches bash with small challenging you can do over `ssh`.

basics/tree.md

@@ -1,6 +1,6 @@
 ---
 title: "tree"
-tags: [ "basics" ]
+tags: [ "basics", "tree", "markdown" ]
 ---
 
 The `tree` utility outputs a full listing of everything in your current directory, and those below.
@@ -23,3 +23,14 @@ README.md
 ```
 
 Each description-line starts with a tab.
+
+## Markdown Conversion
+
+To represent a file structure as a nested series of markdown lists, you can try this horrifying `sed` one-liner:
+
+```bash
+tree -tf --dirsfirst --gitignore --noreport --charset ascii  | \
+    sed -e 's/| \+/  /g' \
+    -e 's/[|`]-\+/ */g' \
+    -e 's:\(* \)\(\(.*/\)\([^/]\+\)\):\1[\4](\2):g'
+```

chat/profanity-otr.md

@@ -0,0 +1,57 @@
+---
+title: "profanity"
+tags: [ "Documentation", "Chat", "OTR" ]
+---
+# otr
+
+'Off The Record' encryption seems mostly dead to me.
+But this is what I did, back in the day...
+
+Install libotr-dev or libotr5-dev or whatever..
+
+```
+sudo apt -y install lib5otr-dev
+```
+
+Make your otr keys.
+
+```
+/otr gen
+```
+
+Then you can start an otr converstation.
+
+```
+/otr start bob@jobbies.org
+```
+
+Or if you already have a conversation windows open, switch to our using:
+
+```
+/otr
+```
+
+Finally, verify!
+
+```
+/otr question "Who are you?" bob
+```
+
+Bob is verified upon the answer, 'bob'.
+
+### OTR Finger Prints
+
+Get yours with 
+
+```
+/otr myfp
+```
+
+```
+/otr theirfp
+```
+
+```
+/otr myfp
+```
+

chat/profanity.md

@@ -1,6 +1,6 @@
 ---
 title: "profanity"
-tags: [ "Documentation", "Chat" ]
+tags: [ "Documentation", "Chat", "omemo" ]
 ---
 # Setup (Commands)
 
@@ -140,54 +140,6 @@ You can ensure omemo automatcally turns on:
 ```
 /omemo policy automatic
 ```
+---
 
-## otr
+'OTR' encryption is mostly dead, but you can find the old instructions [here](profanity-otr).
-
-Install libotr-dev or libotr5-dev or whatever..
-
-```
-sudo apt -y install lib5otr-dev
-```
-
-Make your otr keys.
-
-```
-/otr gen
-```
-
-Then you can start an otr converstation.
-
-```
-/otr start bob@jobbies.org
-```
-
-Or if you already have a conversation windows open, switch to our using:
-
-```
-/otr
-```
-
-Finally, verify!
-
-```
-/otr question "Who are you?" bob
-```
-
-Bob is verified upon the answer, 'bob'.
-
-### OTR Finger Prints
-
-Get yours with 
-
-```
-/otr myfp
-```
-
-```
-/otr theirfp
-```
-
-```
-/otr myfp
-```
-

data/git/hooks.md

@@ -0,0 +1,29 @@
+---
+title: "git hooks"
+tags: [ "Documentation", "data", "git" ]
+---
+
+Check out the sample hooks:
+
+```bash
+cd $GIT_REPO
+ls .git/hooks
+head .git/hooks/pre-commit.sample
+```
+
+Add a hook to check the shell scripts in `$GIT_REPO` before making a commit:
+
+```bash
+echo '#!/bin/sh
+shellcheck *.sh' > .git/hooks/commit-msg
+chmod u+x .git/hooks/commit-msg
+```
+
+## Committing
+
+Your `git hooks` will not enter the repository, but you can commit them to a repository, then request others add these git hooks to their own branch, by putting a note in the project's `README.md`.
+
+```markdown
+The project comes with recommended git hooks.
+You can activate the hooks with `git config core.hooksPath hooks`.
+```

data/gpg.md

@@ -1,142 +1,7 @@
 ---
 title: "gpg"
-tags: [ "Documentation", "data" ]
+tags: [ "Documentation", "data", "GPG" ]
 ---
-# Making keys
-
-Generate keys:
-
-```bash
-gpg --gen-key
-```
-
-Follow the guide.
-
-# Encrypting a file
-
-```bash
-gpg -r malinfreeborn@posteo.net -e file
-```
-
-`-r` specifies the recipient.
-
-Check you have an encrypted version of your file.
-
-# Changing Expiration Dates
-
-gpg --list-keys
-
-... and then use the second part of 'pub', which is the ID.  But that's not appearing here so... on with gpg2?
-
-# Making encrypted files with a local password
-
-Make a password with a password (cypher encryption).
-
-```bash
-gpg -c --output passwords.txt
-```
-
-or 
-
-```bash
-gpg -c > passwords.txt
-```
-
-Put in a password.
-
-Write message then stop with Ctrl+d.
-
-Get the message back out the file with:
-
-```bash
-gpg -d passwords.txt
-```
-
-# Circles of Trust
-
-Search for a key at any key store:
-
-```bash
-gpg --search-keys nestorv
-```
-
-Once you've made a decision about someone:
-
-```bash
-gpg --list-keys
-```
-
-You get something like this:
-
-```
-pub   rsa3072 2021-08-15 [SC] [expires: 2023-08-15]
-      CD30421FD825696BD95F1FF644C62C57B790D3CF
-uid           [ultimate] Malin Freeborn <malinfreeborn@posteo.net>
-sub   rsa3072 2021-08-15 [E] [expires: 2023-08-15]
-
-```
-
-Notice the long, ugly, string - CD30421FD825696BD95F1FF644C62C57B790D3CF - and how horribly ugly it is.
-This is a fingerprint.
-
-You can now decide the trust level (this stays on your computer).
-
-```bash
-gpg --edit-key CD30421FD825696BD95F1FF644C62C57B790D3CF
-```
-
-Once you're in the interface, type `trust`.
-
-```bash
-gpg --sign-key alice@posteo.net
-```
-
-# Swapping Keys
-
-This system relies on a ring of people swapping key information.
-
-## Sending
-
-Send those trusted keys up to a server, so people can see you have verified them:
-
-```bash
-gpg --send-keys 024C6B1C84449BD1CB4DF7A152295D2377F4D70F
-```
-
-## Upload Your Keys
-
-## Add More Key Servers
-
-Key servers often swap keys, but it's best to just send to multiple places immediately.
-You can add key servers by adding this to `~/.gnupg/gpg.conf`.
-
-```
-keyserver hkps://keys.openpgp.org
-keyserver hkps://mail-api.proton.me
-keyserver hkps://keys.mailvelope.com
-```
-
-# Refresh Keys
-
-Refreshing keys will tell you if some key you have contains a signature from someone you already trust, or if someone has published a revocation certificate (meaning their key should not be trusted any more).
-
-```bash
-gpg --refresh-keys
-```
-
-You can use the [crontab](../basics/cron.md) to refresh keys.
-
-# Export
-
-Your public key:
-
-```bash
-gpg --output me.gpg --armor --export
-```
-
-or
-
-```bash
-gpg --export -a person@email.tld > my_key.pub
-```
 
+- [Setup](gpg/basics.md)
+- [Extras](gpg/extras.md)

data/gpg/basics.md

@@ -0,0 +1,141 @@
+---
+title: "GPG Basics"
+tags: [ "Documentation", "data", "GPG" ]
+---
+# Making keys
+
+Generate keys:
+
+```bash
+gpg --gen-key
+```
+
+Follow the guide.
+
+# Encrypting a file
+
+```bash
+gpg -r malinfreeborn@posteo.net -e file
+```
+
+`-r` specifies the recipient.
+
+Check you have an encrypted version of your file.
+
+# Changing Expiration Dates
+
+gpg --list-keys
+
+... and then use the second part of 'pub', which is the ID.  But that's not appearing here so... on with gpg2?
+
+# Making encrypted files with a local password
+
+Make a password with a password (cypher encryption).
+
+```bash
+gpg -c --output passwords.txt
+```
+
+or 
+
+```bash
+gpg -c > passwords.txt
+```
+
+Put in a password.
+
+Write message then stop with Ctrl+d.
+
+Get the message back out the file with:
+
+```bash
+gpg -d passwords.txt
+```
+
+# Circles of Trust
+
+Search for a key at any key store:
+
+```bash
+gpg --search-keys nestorv
+```
+
+Once you've made a decision about someone:
+
+```bash
+gpg --list-keys
+```
+
+You get something like this:
+
+```
+pub   rsa3072 2021-08-15 [SC] [expires: 2023-08-15]
+      CD30421FD825696BD95F1FF644C62C57B790D3CF
+uid           [ultimate] Malin Freeborn <malinfreeborn@posteo.net>
+sub   rsa3072 2021-08-15 [E] [expires: 2023-08-15]
+
+```
+
+Notice the long, ugly, string - CD30421FD825696BD95F1FF644C62C57B790D3CF - and how horribly ugly it is.
+This is a fingerprint.
+
+You can now decide the trust level (this stays on your computer).
+
+```bash
+gpg --edit-key CD30421FD825696BD95F1FF644C62C57B790D3CF
+```
+
+Once you're in the interface, type `trust`.
+
+```bash
+gpg --sign-key alice@posteo.net
+```
+
+# Swapping Keys
+
+This system relies on a ring of people swapping key information.
+
+## Sending
+
+Send those trusted keys up to a server, so people can see you have verified them:
+
+```bash
+gpg --send-keys 024C6B1C84449BD1CB4DF7A152295D2377F4D70F
+```
+
+## Upload Your Keys
+
+## Add More Key Servers
+
+Key servers often swap keys, but it's best to just send to multiple places immediately.
+You can add key servers by adding this to `~/.gnupg/gpg.conf`.
+
+```
+keyserver hkps://keys.openpgp.org
+keyserver hkps://mail-api.proton.me
+keyserver hkps://keys.mailvelope.com
+```
+
+# Refresh Keys
+
+Refreshing keys will tell you if some key you have contains a signature from someone you already trust, or if someone has published a revocation certificate (meaning their key should not be trusted any more).
+
+```bash
+gpg --refresh-keys
+```
+
+You can use the [crontab](../basics/cron.md) to refresh keys.
+
+# Export
+
+Your public key:
+
+```bash
+gpg --output me.gpg --armor --export
+```
+Alternatively:
+
+```bash
+gpg --export -a person@email.tld > my_key.pub
+```
+

data/gpg/extras.md

@@ -0,0 +1,10 @@
+---
+title: "gpg"
+tags: [ "Documentation", "vim", "data", "GPG" ]
+---
+
+The `vim-gnupg` plugin lets vim edit gpg-encrypted files as if they were unencrypted.
+
+It's probably in your package manager.
+If not, you'll need to endure the faff of following the [instructions](http://www.vim.org/scripts/script.php?script_id=3645).
+

data/radicale.md

@@ -29,11 +29,10 @@ Edit `/etc/radicale/config`, changing the `[auth]` section from this:
 
 ...to this:
 ```
-#type = htpasswd
+type = htpasswd
 ```
 
-If the service is started, restart it to make sure nobody can sign in without a password.
+Make sure the service is off, as people may be able to sign in without a password at this point.
-
 
 Next, find the `htpasswd` program.
 You might get it in the `apache` package or similar.
@@ -41,7 +40,7 @@ You might get it in the `apache` package or similar.
 `htpasswd` allows you to generate passwords for users, and place them in `/etc/radicale/users`.
 
 ```bash
-PASS="$(xkcdpass)
+PASS="$(xkcdpass)"
 htpasswd -nb $USER "$PASS" | sudo tee -a /etc/radicale/users
 echo "Your username is $USER"
 echo "Your password is $PASS"
@@ -96,14 +95,12 @@ Finally, replace the example `DOMAIN` with your actual domain name.
 ```bash
 DOMAIN=whatever.com
 sudo sed -i "s/DOMAIN/$DOMAIN/g" /etc/nginx/sites-available/radicale 
-
 ```
 
 (optional: replace that `cal.` prefix with anything else)
 
 Check nginx is happy:
 
-
 ```bash
 sudo nginx -t
 ```
@@ -115,7 +112,6 @@ sudo certbod -d cal.$DOMAIN
 
 Start or restart both services:
 
-
 ```bash
 sudo systemctl start radicale
 sudo systemctl restart nginx
@@ -123,4 +119,4 @@ sudo systemctl restart nginx
 
 You should now be able to log into your calendar, and add it to a phone.
 
-NB: you don't need the port number.
+**NB:** you don't need the port number.

data/sharing_secrets.md

@@ -0,0 +1,23 @@
+---
+title: "Sharing Secrets"
+tags: [ "data", "death", "secrets", "ssss" ]
+---
+
+You can share parts of a secret with multiple people, so only some of them need to agree to see the secret.
+
+Install `ssss`, then decide on the total number of secrets (`N`), and the threshold of people who must share their shard of the secret in order to reveal the secret.
+
+```bash
+N=5
+T=3
+FILE=secret.txt
+fortune | ssss-split -t $T -n $N > $FILE
+```
+Each shard is a line inside secret.txt.
+
+Check it's working:
+
+```bash
+head -n $T $FILE | ssss-combine -t $T
+tail -n $T $FILE | ssss-combine -t $T
+```

data/sqlite.md

@@ -0,0 +1,21 @@
+---
+title: "sqlite"
+tags: [ "Documentation", "data" ]
+---
+
+Work with a database:
+
+```bash
+sqlite3 "$FILE".sqlite3
+```
+Compress the database:
+
+```sqlite
+pragma vacuum;
+```
+Optimize the database:
+
+```sqlite
+pragma optimize;
+```
+

distros/arch/scripts/archpi.sh

@@ -1,57 +0,0 @@
-#!/bin/bash
-
-# https://www.unixmen.com/install-arch-linux-raspberry-pi/
-
-pacman-key --init || echo init fail >> log
-pacman-key --populate archlinuxarm || echo update fail >> log
-pacman -Syyuu || echo update fail  >> log
-
-sed -i s/#en_GB.UTF-8 UTF-8/en_GB.UTF-8 UTF-8/ /etc/locale.gen
-
-echo 'LANG=en_GB.UTF-8' >> /etc/locale.conf
-
-locale-gen
-
-pacman -S base-devel htop ranger tmux lolcat fortune-mod git figlet rxvt-unicode task timew calcurse fail2ban
-# texlive-most 
-if [[ $2 == all || $1 == all ]]; then
-	pacman -S nnn feh dmenu rofi xf86-video-fbdev xorg xorg-xinit xorg-server xorg-server-utils xterm
-fi
-
-# Audio
-echo 'dtparam=audio=on' >> /boot/config.txt
-
-if [[ $1 == audio ]]; then
-	pacman -S alsa-utils alsa-firmware alsa-lib alsa-plugins 
-fi
-
-echo 'device_tree_param=spi=on' >> /boot/config.txt
-
-# for a vnc viewer
-if [[ $1 == vnc ]]; then
-	tigervnc gcc geany i3 i3status compton feh sxiv rxvt-unicode 
-fi
-
-# Swap
-
-cd /var/cache/swap
-
-dd if=/dev/zero of=swapfile bs=1K count=2M
-
-chmod 600 swapfile
-
-mkswap swapfile
-
-swapon swapfile
-
-echo "/var/cache/swap/swapfile none swap sw 0 0" > /etc/fstab
-
-# fail2ban
-
-[ -e sshd.local ] && \
-pacman -S fail2ban && \
-mv sshd.local /etc/fail2ban/jail.d && \
-systemctl start fail2ban
-
-# If it won't reboot, install `arch-install-scripts` then try again and firstly:
-# genfstab / > /etc/fstab

distros/arch/scripts/gitea_install.sh

@@ -1,9 +0,0 @@
-#!/bin/sh
-pacman -S gitea postgresql
-sudo su postgres -c 'initdb -D /var/lib/postgres/data'
-sudo systemctl start postgresql
-sudo su postgres -c 'createuser -P gitea'
-sudo su postgres -c 'createdb -O gitea gitea'
-sudo sed -i 's/mysql/postgres/' /etc/gitea/app.ini
-sudo sed -i 's/root/gitea/' /etc/gitea/app.ini
-sudo systemctl start gitea

distros/arch/scripts/pihole.sh

@@ -1,79 +0,0 @@
-#!/bin/bash
-
-set -e
-
-yay -S pi-hole-ftl pi-hole-server
-
-# Configuration in /etc/pihole/pihole-FTL.db
-# You can change DBINTERVAL to 60 or more to limit writes to disk
-
-sudo systemctl disable --now systemd-resolved
-sudo systemctl enable --now pihole-FTL
-pihole -g
-pihole -c
-
-if [ "$1" == "unbound" ]; then
-
-sudo pacman -S unbound
-
-sudo cp /etc/unbound/unbound.conf /etc/unbound/unbound.conf.old
-
-echo "server:
-    # If no logfile is specified, syslog is used
-    # logfile: "/var/log/unbound/unbound.log"
-    verbosity: 0
-
-    interface: 127.0.0.1
-    port: 5335
-    do-ip4: yes
-    do-udp: yes
-    do-tcp: yes
-
-    # May be set to yes if you have IPv6 connectivity
-    do-ip6: no
-
-    # You want to leave this to no unless you have *native* IPv6. With 6to4 and
-    # Terredo tunnels your web browser should favor IPv4 for the same reasons
-    prefer-ip6: no
-
-    # Use this only when you downloaded the list of primary root servers!
-    # If you use the default dns-root-data package, unbound will find it automatically
-    #root-hints: "/var/lib/unbound/root.hints"
-
-    # Trust glue only if it is within the server's authority
-    harden-glue: yes
-
-    # Require DNSSEC data for trust-anchored zones, if such data is absent, the zone becomes BOGUS
-    harden-dnssec-stripped: yes
-
-    # Don't use Capitalization randomization as it known to cause DNSSEC issues sometimes
-    # see https://discourse.pi-hole.net/t/unbound-stubby-or-dnscrypt-proxy/9378 for further details
-    use-caps-for-id: no
-
-    # Reduce EDNS reassembly buffer size.
-    # Suggested by the unbound man page to reduce fragmentation reassembly problems
-    edns-buffer-size: 1472
-
-    # Perform prefetching of close to expired message cache entries
-    # This only applies to domains that have been frequently queried
-    prefetch: yes
-
-    # One thread should be sufficient, can be increased on beefy machines. In reality for most users running on small networks or on a single machine, it should be unnecessary to seek performance enhancement by increasing num-threads above 1.
-    num-threads: 1
-
-    # Ensure kernel buffer is large enough to not lose messages in traffic spikes
-    so-rcvbuf: 1m
-
-    # Ensure privacy of local IP ranges
-    private-address: 192.168.0.0/16
-    private-address: 169.254.0.0/16
-    private-address: 172.16.0.0/12
-    private-address: 10.0.0.0/8
-    private-address: fd00::/8
-    private-address: fe80::/10
-" | sudo   tee /etc/unbound.conf
-
-	echo "Make this the  only pihole DNS: PIHOLE_DNS_1=127.0.0.1 in /etc/pihole/setupVars.conf"
-
-fi
-

distros/arch/scripts/steam.sh

@@ -1,8 +0,0 @@
-#!/bin/bash
-
-flatpak --user remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
-
-flatpak --user install flathub com.valvesoftware.Steam
-
-flatpak run com.valvesoftware.Steam
-

distros/arch/scripts/yay.sh

@@ -1,10 +0,0 @@
-git clone https://aur.archlinux.org/yay.git
-
-cd yay
-
-makepkg -si
-
-yay -S perl-graph-easy signal-desktop sc-im ncpamixer xdg-utils-mimeo torrench
-
-yay -S ttf-tengwar-annatar
-

distros/void/locale.md

@@ -1,6 +1,6 @@
 ---
-title: "locales"
+title: "Void locale"
-tags: [ "void" ]
+tags: [ "void", "locale" ]
 ---
 
 Check the current locales:

networking/graph-easy.md

@@ -1,6 +1,6 @@
 ---
-title: "graph-easy"
+title: "Easy Network Graph"
-tags: [ "Documentation" ]
+tags: [ "Documentation", "Networking" ]
 ---
 Set up a file like this, called `troubleshooting.txt`.
 

networking/pip.md

@@ -1,27 +0,0 @@
----
-title: "pip"
-tags: [ "Documentation", "Networking" ]
----
-```
-
-Searching does not work.
-
-Install with:
-
-```bash
-pip install [ package ]
-```
-
-Upgrade all packages
-
-```bash
-pip freeze --local | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U
-```
-
-# Troubleshooting
-
-You may need a python3 package.
-In this case, try:
-
-```bash
-pip3 install [ package ]

networking/transmission.md

@@ -136,3 +136,32 @@ Without the `--anonymize` flag, the torrent file output will have a 'created by'
 - udp://explodie.org:6969/announce
 - https://tracker.gbitt.info:443/announce
 - http://tracker.gbitt.info:80/announce
+
+## Verify
+
+Add your torrent and notes its number:
+
+```bash
+transmission-remote -a "$file".torrent
+transmission-remote -l
+transmission-remote -t "$number" -i
+```
+
+The information in the last command shows that it's not verified, so you can verify with `-v`.
+
+```bash
+transmission-remote -t "$number" -v
+```
+
+If transmission cannot find it, then tell it where to find the torrent:
+
+```bash
+transmission-remote -t "$number" --find "$(pwd)"
+```
+...and of course, make sure the permissions allow transmission to see the target.
+
+
+```bash
+ls -ld "$file"
+```
+

new.sh

@@ -14,7 +14,7 @@ filePath="$category/$(echo $name | sed 's/ /_/g').md"
 
 tagsList="$(echo \"$category | sed 's#\/#", "#g')\""
 
-[ -e "$filePath" ] && $EDITOR $filePath && exit 0
+[ -e "$filePath" ] && $EDITOR "$filePath" && exit 0
 
 echo "---
 title: \"$name\"

system/monitoring.md

@@ -0,0 +1,24 @@
+---
+title: "Monitoring"
+tags: [ "Documentation", "System", "CPU", "Memory" ]
+---
+
+Print the average CPU load over 1 minute, 5 minutes, and 15 minutes:
+
+```bash
+watch -d cat /proc/loadavg
+stress="$(cat /proc/loadavg | awk '{print "Usage:" $2"%"}')"
+```
+
+Show memory usage in Gibitytes.
+
+```bash
+free -g
+```
+Show low and high gigibtye usage on a *l*ine, and repeat the measurement every 5 seconds:
+
+```bash
+REP=5
+free --lohi -g -s $REP | lolcat
+```
+

system/systemd/journal.md

@@ -2,6 +2,18 @@
 title: "journal"
 tags: [ "Documentation", "systemd" ]
 ---
+
+See a running log of all system messages:
+
+
+```bash
+journalctl -f
+```
+
+Or just one unit (`sshd`):
+
+```bash
+journalctl -f -u sshd
 ```
 
 Find errors since November
@@ -14,3 +26,13 @@ Limit size to 2G.
 
 ```bash
 journalctl --vacuum-size=2G
+```
+
+Log the fact that you've installed your own `dnsmasq` on your system to `journalctl`, so that you can notice why your system's broken:
+
+
+```bash
+logger "Installed new dnsmasq"
+sudo journalctl -f
+```
+

vision/lowdown.md

@@ -0,0 +1,21 @@
+---
+title: "Markdown to PDF"
+tags: [ "Documentation", "Markdown", "PDF", "Vision" ]
+---
+
+Turn a markdown file into a pdf:
+
+```bash
+lowdown -stms "$FILE".md | pdfroff -itk -mspdf > "$FILE".pdf
+```
+
+To give the document a title, put that title in the metadata:
+
+```bash
+sed -i "1 i---" "$FILE".md
+sed -i "1 ititle: $TITLE" "$FILE".md
+sed -i "1 i---" "$FILE".md
+lowdown -L "$FILE".md
+lowdown -X title "$FILE".md
+lowdown -stms "$FILE".md | pdfroff -itk -mspdf > "$FILE".pdf
+```