extrace: add page

pages/linux/extrace.md

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+# extrace
+
+> Trace exec() calls.
+> More information: <https://github.com/chneukirchen/extrace>.
+
+- Trace all program executions occurring on the system:
+
+`sudo extrace`
+
+- Run a command and only trace descendants of this command:
+
+`sudo extrace {{command}}`
+
+- Print the current working directory of each process:
+
+`sudo extrace -d`
+
+- Resolve the full path of each executable:
+
+`sudo extrace -l`
+
+- Display the user running each process:
+
+`sudo extrace -u`