scriptreplay: add page

pages/linux/scriptreplay.md

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+# scriptreplay
+
+> Replay a typescript created by the script command to standard output.
+
+- Replay a typescript at the speed it was recorded:
+
+`scriptreplay {{path/to/timing_file}} {{path/to/typescript}}`
+
+- Replay a typescript at double the original speed:
+
+`scriptreplay {{path/to/timingfile}} {{path/to/typescript}} 2`
+
+- Replay a typescript at half the original speed:
+
+`scriptreplay {{path/to/timingfile}} {{path/to/typescript}} 0.5`