Grub.conf kernel field boot messages verbosity configuration

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Operating Systems Linux Red Hat Grub.conf kernel field boot messages verbosity configuration
# 1  
Old 12-03-2013
Grub.conf kernel field boot messages verbosity configuration

I am trying to understand what are the differences of boot messages verbosity levels for the kernel field in grub.conf

From my research, there appear to be three levels:

I have also found documents that specify removing quiet from the kernel field. If this is done, is there a fourth default level or does the messaging level default to verbose or debug?
# 2  
Old 12-03-2013
quiet and debug are Linux kernel command line parameters. They are not specific to GRUB.


quiet just disables most kernel log messages. Removing quiet reverts level of kernel log messages back to default.

verbose is a hack on some Linux distributions. If present on the kernel command line, one of the initialization files - such as /etc/rc.sysinit, or /etc/rc.d/rc.sysinit - does something like the following:
if /bin/grep -q " verbose" /proc/cmdline; then /bin/dmesg -n 8; fi

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