clean up old formatting

data/archives.md

@@ -10,7 +10,7 @@ tags:
 Combine many files and directories into a single t-archive file.
 
 ```sh
-tar cf "$ARCHIVE".tar $DIR
+tar cf "${archive}".tar ${dir}
 ```
 You can remember this with the mnemonic '*C*reate *F*ile'.
 
@@ -18,13 +18,13 @@ Unfortunately, this stores the full file path, so making a tar archive of `/etc/
 It's often better to tell tar which path to start from using the `-C` flag.
 
 ```sh
-tar cf "$ARCHIVE".tar -C /etc/ nginx
+tar cf "${archive}".tar -C /etc/ nginx
 ```
 
 Check the contents of your archive with:
 
 ```sh
-tar tf "$ARCHIVE".tar
+tar tf "${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.
@@ -33,7 +33,7 @@ Instead, you can store the target in a variable:
 
 ```sh
 files=$(ls /etc/nginx)
-tar cf "$ARCHIVE".tar -C /etc/nginx/ $file
+tar cf "${archive}".tar -C /etc/nginx/ $file
 ```
 
 # Extract
@@ -41,7 +41,7 @@ tar cf "$ARCHIVE".tar -C /etc/nginx/ $file
 Extract the tar archive with
 
 ```sh
-tar xf "$ARCHIVE".tar
+tar xf "${archive}".tar
 ```
 
 You can remember this with the mnemonic 'e*X*tract *F*ile'.
@@ -51,7 +51,7 @@ You can remember this with the mnemonic 'e*X*tract *F*ile'.
 Create a zip-compressed archive with the `z` flag.
 
 ```sh
-tar czf "$ARCHIVE".tgz -C /etc/nginx/ $file
+tar czf "${archive}".tgz -C /etc/nginx/ $file
 ```
 
 You can use any file ending you want, but sane people like to use '.tgz' or '.tar.tgz'.