GCORE(1) General Commands Manual GCORE(1)

gcore
get core images of running process

gcore [-c corename] pid [pid ...]

gcore creates a core image of the specified processes suitable for use with gdb(1). By default, the core is written to the file “<progname>.core”, where “⟨progname⟩” is the program name of the process corresponding to the pid that is given on the command line. This filename can be changed by supplying the -c corename argument, or setting “proc.<pid>.corename” with sysctl(8).

<progname>.core
The core image.

gdb(1), sysctl(8)

gcore appeared in 4.2BSD, disappeared in NetBSD 1.2, and reappeared in NetBSD 2.0.
March 26, 2017 NetBSD 9.2