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

tldr/linux/exec

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# exec
+
+> Execute a command without creating a child process.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-exec>.
+
+- Execute a specific command:
+
+`exec {{command -with -flags}}`
+
+- Execute a command with a (mostly) empty environment:
+
+`exec -c {{command -with -flags}}`
+
+- Execute a command as a login shell:
+
+`exec -l {{command -with -flags}}`
+
+- Execute a command with a different name:
+
+`exec -a {{name}} {{command -with -flags}}`