$ gdb --args gnuplot -p -e "data_file='ttyACM0-870.csv'" example2.gp
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Reading symbols from gnuplot...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/gnuplot -p -e data_file=\'ttyACM0-870.csv\' example2.gp
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffead7e700 (LWP 31925)]
[New Thread 0x7fffea10d700 (LWP 31926)]
[New Thread 0x7fffe990c700 (LWP 31927)]
[Thread 0x7fffead7e700 (LWP 31925) exited]
[Thread 0x7fffea10d700 (LWP 31926) exited]
[Thread 0x7ffff7fb2940 (LWP 31921) exited]
[Inferior 1 (process 31921) exited normally]
(gdb) quit