Create watch.md

pages/linux/watch.md

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+# watch
+
+> Execute a command repeatedly, and monitor the output in full-screen mode
+
+- monitor files in the current folder
+
+`watch {{ls}}`
+
+- monitor disk space and highlight the changes
+
+`watch -d {{df}}`
+
+- monitor "node" processes, refreshing every 3 seconds
+
+`watch -n {{3}} "{{ps aux | grep node}}"