SYNOPSIS
       gcore [-o filename] pid

DESCRIPTION
       Generate a core dump of a running program with process ID pid.  Produced file is equivalent to a kernel
       produced core file as if the process crashed (and if "ulimit -c" were used to set up an appropriate core dump
       limit).  Unlike after a crash, after gcore the program remains running without any change.

OPTIONS
       -o filename
           The optional argument filename specifies the file name where to put the core dump.  If not specified, the
           file name defaults to core.pid, where pid is the running program process ID.