dash: add page

pages/linux/dash.md

@@ -0,0 +1,20 @@
+# dash
+
+> Debian Almquist Shell. Roughly 4x times faster than Bash.
+> Modern POSIX-compliant implementation of `sh`(isn't Bash compatible).
+
+- Start interactive shell:
+
+`dash`
+
+- Execute a command:
+
+`dash -c "{{command}}"`
+
+- Run commands from a file:
+
+`dash {{file.sh}}`
+
+- Run commands from a file, logging all commands executed to the terminal:
+
+`dash -x {{file.sh}}`