display shell code being executed in initramfs.
grml debug=noscreen Get shells during process of booting, verbose, but without using GNU screen
grml nocolor Disable colorized output while booting
+ Also set SYSTEMD_COLORS=0 to disable colors in systemd output
grml log Log error messages while booting to /tmp/grml.log.`date +%Y%m%d`"
and /var/log/boot
grml testcd Check CD data integrity and md5sums