mkswap: add page (#1984)

pages/linux/mkswap.md

@@ -0,0 +1,19 @@
+# mkswap
+
+> Sets up a Linux swap area on a device or in a file.
+
+- Setup a given partition as swap area:
+
+`sudo mkswap {{/dev/sdb7}}`
+
+- Use a given file as swap area:
+
+`sudo mkswap {{path/to/file}}`
+
+- Check a partition for bad blocks before creating the swap area:
+
+`sudo mkswap -c {{/dev/sdb7}}`
+
+- Specify a label for the file (to allow `swapon` to use the label):
+
+`sudo mkswap -L {{swap1}} {{path/to/file}}`