Add page: psgrep (#2609)

pages/common/psgrep.md

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+# psgrep
+
+> Search through processes with grep.
+
+- Find process lines containing a specific string:
+
+`psgrep {{process_name}}`
+
+- Find process lines containing a specific string, do not include headers:
+
+`psgrep -n {{process_name}}`
+
+- Search using simplified format (PID, user, command):
+
+`psgrep -s {{process_name}}`