pidof: add page (#3948)

pages/linux/pidof.md

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+# pidof
+
+> Gets the ID of a process using its name.
+
+- List all process IDs with given name:
+
+`pidof {{bash}}`
+
+- List a single process ID with given name:
+
+`pidof -s {{bash}}`
+
+- List process IDs including scripts with given name:
+
+`pidof -x {{script.py}}`
+
+- Kill all processes with given name:
+
+`kill "$(pidof {{name}})" `