Move pages under tldr, lint run.sh, update docs

tldr/shuf

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# shuf
+
+> Generate random permutations.
+> More information: <https://www.gnu.org/software/coreutils/shuf>.
+
+- Randomize the order of lines in a file and output the result:
+
+`shuf {{path/to/file}}`
+
+- Only output the first 5 entries of the result:
+
+`shuf --head-count={{5}} {{path/to/file}}`
+
+- Write the output to another file:
+
+`shuf {{path/to/input}} --output={{path/to/output}}`
+
+- Generate 3 random numbers in the range 1-10 (inclusive):
+
+`shuf --head-count={{3}} --input-range={{1-10}} --repeat`