Next: default, Previous: config_file, Up: Special environment variables [Contents][Index]

#### 15.1.9 debug

This variable may be set to enable debugging output from various components of GRUB. The value is an ordered list of debug facility names separated by whitespace or ‘`,`’. If the special facility named ‘`all`’ is present then debugging output of all facility names is enabled at the start of processing the value of this variable. A facility’s debug output can then be disabled by prefixing its name with a ‘`-`’. The last occurence facility name with or without a leading ‘`-`’ takes precendent over any previous occurence. This allows the easy enabling or disabling of facilities by appending a ‘`,`’ and then the facility name with or without the leading ‘`-`’, which will preserve the state of the rest of the facilities. The facility names are the first argument to grub_dprintf. Consult the source for more details.