change formatting

input examples are now given as

```bash
input $ARG1
```

While outputs use md's '> ' sign as a quote.

data/backups/archives.md

@@ -1,26 +1,79 @@
 ---
-title: "archives"
-tags: [ "Documentation", "backups" ]
+title: "Archives"
+tags: [ "Documentation", "tar", "backups" ]
 ---
-# GPG Archives
+# `tar`
 
-Create an encrypted archive with `gpg`:
+## Create
 
-> tar czvpf - file1.txt file2.pdf file3.jpg | gpg --symmetric --cipher-algo aes256 -o myarchive.tar.gz.gpg
+Combine many files and directories into a single t-archive file.
 
-And extract it with `gpg`:
+```bash
+tar cf "$ARCHIVE".tar $DIR
+```
+You can remember this with the mnemonic '*C*reate *F*ile'.
 
-> gpg -d myarchive.tar.gz.gpg | tar xzvf -
+Unfortunately, this stores the full file path, so making a tar archive of `/etc/nginx/` will store `etc/nginx` (without the leading `/`.
+
+It's often better to tell tar which path to start from using the `-C` flag.
+
+```bash
+tar cf "$ARCHIVE".tar -C /etc/ nginx
+```
+
+Check the contents of your archive with:
+
+```bash
+tar tf "$ARCHIVE".tar
+```
+
+If you want to store 'everything in a directory', then using `*` will not work, because it will target everything in the *current* directory.
+
+Instead, you can store the target in a variable:
+
+```bash
+files=$(ls /etc/nginx)
+tar cf "$ARCHIVE".tar -C /etc/nginx/ $file
+```
+
+## Extract
+
+Extract the tar archive with
+
+> tar xf "$ARCHIVE".tar
+
+You can remember this with the mnemonic 'e*X*tract *F*ile'.
+
+## Compress
+
+Create a zip-compressed archive with the `z` flag.
+
+```bash
+tar czf "$ARCHIVE".tgz -C /etc/nginx/ $file
+```
+
+You can use any file ending you want, but sane people like to use '.tgz' or '.tar.tgz'.
 
 # 7zip
 
+(also called 'p7zip' or '7z')
+
 Make archive:
 
-> 7za a -tzip -pPASSWORD -mem=AES256 archive.zip file1 file2
-
+```bash
+PASSWORD=my_password
+```
+```bash
+7za a -tzip -p$PASSWORD -mem=AES256 $ARCHIVE.zip $FILE_1 $FILE_2
+```
 Note that people can still see every filename in your archive, and can change those files.
+They just can't read the contents.
 
 Unzip:
 
-> 7za e archive.zip
+```bash
+7za x archive.zip
+```
 
+7zip will open anything: zip-files, rar-files, a tin of beans, *anything*.
+However, the extracted tgz files will just be tar files, so you will still need to use tar to extract them (see above).

data/backups/unison.md

@@ -5,28 +5,36 @@ tags: [ "Documentation", "Backups" ]
 
 Install unison on both machines, and make sure both have the same version of unison, with the same version of the ocaml compiler (the smallest difference will cause problems).
 
-> unison -version
+```bash
+unison -version
+```
 
 Create the `~/.unison` directory on both machines.
 
 Make a job called `backup`:
 
-> vim ~/.unison/*backup*.prf
-
-You can name the file anything, but it must end in .prf.
-
-Here is an example job, which synchronizes the `~/music` directory with a remote machine.
-
+```bash
+JOB=backup
 ```
+
+Here is an example job, which synchronizes the `~/music` directory with a remote machine which has the same username.
+
+
+```bash
+echo "
 auto = true
-root=/home/ghost
-root=ssh://ghost@192.168.0.10//home/ghost/
+root=$HOME
+root=ssh://$USER@$IP_ADDRESS/$HOME
 
 path=music
 
 ignore=Name *.flac
+" > ~/.unison/"$JOB".prf
 
 ```
+
+Remember to specify `$IP_ADDRESS`
+
 The last command means it will ignore any file with a name ending in `.flac`.
 
 ## Automatic Runs
@@ -34,11 +42,12 @@ The last command means it will ignore any file with a name ending in `.flac`.
 The first command means this will run but also confirm which files will be deleted, and which will be transferred, us `batch = true` instead.
 Or you can deleted that line in the `.prf` file and run it with a flag:
 
-> unison -batch *backup*.prf
+```bash
+unison -batch *backup*.prf
+```
 
 Set unison to run with crontab or a systemd unit file to have directories synchronize automatically.
 
-
 ## Problem Solving
 
 You will see data files summarizing what has happened in the `~/.unison` directory.