bash_version      575 src/subshell/common.c     int bash_version;
bash_version      671 src/subshell/common.c         if (sscanf (subshell_cursor_buffer, "%d:%d", &bash_version, &cursor_position) != 2)
bash_version      678 src/subshell/common.c         bash_version = 1000;
bash_version      694 src/subshell/common.c     if (bash_version < 5)  // implies SHELL_BASH