diff --git a/pages/linux/mdadm.md b/pages/linux/mdadm.md
index 783117baaf..c089b248a3 100644
--- a/pages/linux/mdadm.md
+++ b/pages/linux/mdadm.md
@@ -12,15 +12,15 @@
 
 - mark disk as failed
 
-`mdadm {{/path/to/raid_device_file}} -f {/path/to/disk_device_file{}}`
+`mdadm {{/path/to/raid_device_file}} -f {{/path/to/disk_device_file}}`
 
 - remove disk
 
-`mdadm {{/path/to/raid_device_file}} -r {/path/to/disk_device_file{}}`
+`mdadm {{/path/to/raid_device_file}} -r {{/path/to/disk_device_file}}`
 
 - add disk to array
 
-`mdadm {{/path/to/raid_device_file}} -a {/path/to/disk_device_file{}}`
+`mdadm {{/path/to/raid_device_file}} -a {{/path/to/disk_device_file}}`
 
 - show RAID info
 
diff --git a/pages/linux/shuf.md b/pages/linux/shuf.md
new file mode 100644
index 0000000000..bdf3e75bba
--- /dev/null
+++ b/pages/linux/shuf.md
@@ -0,0 +1,19 @@
+# shuf
+
+> generate random permutations
+
+- randomize the order of lines in a file and output the result
+
+`shuf {{filename}}`
+
+- only output the first n entries of the result
+
+`shuf -n {{n}} {{filename}}`
+
+- write output to another file
+
+`shuf -o {{another_filename}} {{filename}}`
+
+- generate random numbers in range
+
+`shuf -i {{low}}-{{high}}`