export: add page

pages/common/export.md

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+# export
+
+> Command to set environment variables.
+
+- Set a new environment variable:
+
+`export {{VARIABLE}}={{value}}`
+
+- Echo the value of an environment variable (don't forget the Dollar sign):
+
+`echo {{$VARIABLE}}`
+
+- Append something to the PATH variable:
+
+`export PATH=$PATH:{{/path/to/append}}`