Move pages back into a "pages" folder

pages/common/pgrep.md

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+# pgrep
+
+> Find or signal process by name
+
+- return PIDs of any running processes with a matching command string 
+
+`pgrep {{Finder}}`
+
+- case insensitive greping
+
+`pgrep -i {{fireFOx}}`
+
+- search full command line with parameters instead of just the process name
+
+`pgrep -f "{{ssh root}}"`
+
+- search for process run by a specific user
+
+`pgrep -u root {{firefox}}`
+
+- kill all processes which match
+
+`pkill -9 {{Finder}}`